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Communication and Life Skills, Optometry Notes, Optometry Semester 1

Effective Communication With Key Population

OPTOMETRY · SEMESTER 1 Effective Communication With Key Population Communication and Life Skills START READING NOTES Contents of This Topic Learning Objectives Communicating With Key Population. The group of key population includes; The group of key population cont… Transgender people Sex workers People who inject drugs(PWID) Effective Communication With Key Population People living with HIV Concept Of Communication In Interacting With Key Populations. Presentations Small Groups BARRIERS AND CHALLENGE OF COMMUNICATING WITH KEY POPULATION BARRIERS cont…….. CHALLENGES OF COMMUNICATING WITH KEY POPULATION Provision of false information . Techniques Of Communication In Interacting With Key Populations Prepare conducive environment. DEMONSTRATE SKILLS OF EFFECTIVE COMMUNICATION IN INTERACTING WITH KEY POPULATIONS Learning Objectives By the end of this session, students are expected to be able to: a) Define the term Key Populations b) Outline groups in the Key Populations c) Explain the concept of communication in interacting with Key Populations d) Explain challenges of communication in interacting with Key Populations e) Apply techniques of communication in interacting with Key Populations Communicating With Key Population. Key population Are groups which are vulnerable and are at high risk of being affected or infected by HIV. Or Are groups who due to specific higher risk behavior are at increased risk of HIV in respect of epidemic type or control context, Also they have legal and social issues related to their behavior that increase their vulnerability to HIV. The group of key population includes; Men who have sex with men Transgender people People who inject drugs Sex workers People living with HIV The group of key population cont… Men who have sex with men These are people who engage in sexual activities with members of the same sex regardless of how they identify themselves; many of these men do not sexually identify as guys, homosexual or bisexual. Transgender people Are people who have gender identity or gender expression that differs from their assigned sex; this may include people who are not exclusively masculine or feminine Sex workers Are those people who are employed in sex industry including those who provide direct sexual services as well as staffs of such industries. These might be female, male or transgender (18 years old or above )who receive money or goods in exchange for sexual services ,either regularly or occasionally People who inject drugs(PWID) These are among the group most vulnerable to HIV infection. HIV prevalence among people who inject drugs is 28 times higher than among the rest of the population. Effective Communication With Key Population Drug use now accounts for an ever-growing proportion of those living with HIV. On average one in ten new HIV infection are caused by sharing needle. The term drug users is often used to refer to a person who illegal consumes psychoactive substance People living with HIV Are people Infected with HIV /AIDS either from birth or other means to life experience . Concept Of Communication In Interacting With Key Populations. Discussion Is the core method, participants reflects on their own experience, share with others, arise issues and plan for action together. All of the sessions are built around discussion. Through discussion people involved can be able to share different ideas. Presentations Are kept to a minimum and used only to summarize sessions or to explain facts, where participants are confused. Small Groups Are used to maximum participation in decisions. Some participants feel shy in large groups and are more comfortable in small groups. Small groups also can be used to do “task groups” Buzz Groups A small group of people that is divided from large groups to talk about ideas, solution to problem. It is hard to remain silent in group of two people. Rotational Brain Storming Is the another form of brain storming done in small groups. Each given a topic and begins by recording ideas in flip chart. BARRIERS AND CHALLENGE OF COMMUNICATING WITH KEY POPULATION Different In Perception When interacting with key population like sex workers information can be interpret in different ways and cause the barriers during communication. BARRIERS cont…….. Different In Language The use of alcohol and drugs can lead to the use of abusing language to others. This lead to misunderstanding during communication. Different In Personalities Most of people in a group of key population are more aggressive and assertive, due to this lead to difficulties during making communication with them. CHALLENGES OF COMMUNICATING WITH KEY POPULATION Closure of information. The client might give wrong information when asking questions and trying to get some information to him or her. Rejection to speak. Due to psychological problems or side effects of drugs that they use, can lead to him or her reject to speak during conversation. Provision of false information . A client may refuse to give true information with the afraid that his or her information can be disclosed. Poor participation in discussions. Due to lack of participation in speaking also lead to poor participation in a topic discussed. Concealed of interest. Failure to reveal one’s interest may lead to poor communication. Techniques Of Communication In Interacting With Key Populations Maintain relationship Through creating good rapport with the key population Accept individual’s attitude decision making of the individual should be supported Self-esteem building The personal must have enough self-confidence while communicating with the key population. Prepare conducive environment. You should prepare the friendly environment for communication. Ensure the presence of the security Person communicating with the key population must ensure the safety of the people communicating with confidentiality. Ensure the presence of the confidentiality so as to encourage the person to express their feelings ← PREVIOUS TOPICNEXT TOPIC →VIEW MODULE NOTESVIEW SEMESTER NOTESALL OPTOMETRY NOTES Need These Notes as PDF? Request a formatted copy for offline study, printing or revision. GET PDF NOTES ON WHATSAPP

Communication and Life Skills, Optometry Notes, Optometry Semester 1

Communication with People with Visual Impairment

OPTOMETRY · SEMESTER 1 Communication with People with Visual Impairment Communication and Life Skills START READING NOTES Contents of This Topic Effective communication in interacting wit people with visual disability Objectives 1. Definition Types of visual disabilities Signs of visual impairment 2. Concept of communication in interacting with people with visual disability 2. Concept of communication in interacting with people with visual disability….. 3. Challenges of communication in interacting with people with visual disability 3. Challenges of communication in interacting with people with visual disability….. 4. TECHNIQUES OF COMMUNICATION IN INTERACTING WITH PEOPLE WITH VISUAL DISABILITY 4. TECHNIQUES OF COMMUNICATION IN INTERACTING WITH PEOPLE WITH VISUAL DISABILITY….. Effective communication in interacting wit people with visual disability Session 6 Objectives a) Define the term visual disability b) Explain the concept of communication in interacting with people with visual disability c) Explain challenges of communication in interacting with people with visual disability d) Communicate with people with visual disability 1. Definition Visual disability : Refers to a significant impairment in vision that cannot be fully corrected by glasses, lenses, medication, or surgery, and which interferes with normal daily functioning Types of visual disabilities Visual impairment varies from shadowy vision to total blindness. Categorized by severity ( low, severe and blindness) Low vision/moderate- Reduced vision, person can still see shapes, light or large print Severe visual impairment- very limited perception of light /shapes, requiring aids Total blindness- no light perception Signs of visual impairment Squinting Tilting the head to see better Sensitivity to light Closing one eye to read well Frequently eye rubbing when not sleepy Holding book too close Consistently sitting to close to the TV 2. Concept of communication in interacting with people with visual disability Communicating with visual impairment patients involves using all available senses, emphasizing verbal clarity, touch (when appropriate)and creating a safe and respectful environment. 2. Concept of communication in interacting with people with visual disability….. The key concept are: Communication is more verbal than non-verbal because patient cannot interpret visual cues The provider should announce their presence, introduce themselves, and explain every action The environment should be safe , predictable and well described 2. Concept of communication in interacting with people with visual disability….. Tone of voice, pace and clarity are essential The patient relies heavily on auditory cues and information given orally Encourage patient autonomy(independence) – guide, but do not push or handle them without consent Communication must restore trust and dignity 3. Challenges of communication in interacting with people with visual disability Lack of access to non-verbal cues Patient cannot observe facial expressions, gestures, or body language Misinterpretation of emotional is common Fear, anxiety, or loss of confidence Visual impairment can cause: Fear of unknown Reduced trust in unfamiliar environments Anxiety in navigating new place(e.g., hospital) 3. Challenges of communication in interacting with people with visual disability….. Poor environmental orientation Difficult locating: Seats Doors Health worker Examination rooms Lack of proper orientation leads to confusion 3. Challenges of communication in interacting with people with visual disability….. Overdependence on others Patient may rely heavily on others for physical guidance Without proper guidance, communication become stressful Physical barriers Poor signage Obstacles in pathway Lack of tactile(touch) guidance 3. Challenges of communication in interacting with people with visual disability….. Provider- related challenges Use of unclear instructions Forget to introduce themselves Move objective or the patient without explaining Stigma and discrimination Some people may assume visually impaired patient cannot understand or make decisions 4. TECHNIQUES OF COMMUNICATION IN INTERACTING WITH PEOPLE WITH VISUAL DISABILITY Preparing the environment Ensure the setting is safe, calm, and free of obstacles Do not move the patient belonging without permission If you guide the patient, ask first and allow them to hold your arm 4. TECHNIQUES OF COMMUNICATION IN INTERACTING WITH PEOPLE WITH VISUAL DISABILITY….. B. Start with clear introductions Approach the patient calmly Never touch the patient without without verbal warning 4. TECHNIQUES OF COMMUNICATION IN INTERACTING WITH PEOPLE WITH VISUAL DISABILITY….. C. Use clear and descriptive verbal communication Speak on the normal tone- not too loud unless requested Describe what is happening D. Encourage active participation Ask open ended questions Allow the patient to explain their needs 4. TECHNIQUES OF COMMUNICATION IN INTERACTING WITH PEOPLE WITH VISUAL DISABILITY….. E. Use touch appropriately Touch should be gentle and professional, only after permission Inform the patient before any physical contact F. Maintain respect and dignity Speak direct to the patient not to the caregiver Do not assume they cannot understand medical information Give full informed consent explanations, using simple language 4. TECHNIQUES OF COMMUNICATION IN INTERACTING WITH PEOPLE WITH VISUAL DISABILITY….. G. Provide orientation and mobility assistance Describe the environment Allow the patient to move on their own pace H. Check for understanding Ask if they understood on what you explained I. Closing Summarize the key points Inform the patient when your about to leave ← PREVIOUS TOPICNEXT TOPIC →VIEW MODULE NOTESVIEW SEMESTER NOTESALL OPTOMETRY NOTES Need These Notes as PDF? Request a formatted copy for offline study, printing or revision. GET PDF NOTES ON WHATSAPP

Communication and Life Skills, Optometry Notes, Optometry Semester 1

Customer Care

OPTOMETRY · SEMESTER 1 Customer Care Communication and Life Skills START READING NOTES Contents of This Topic CUSTOMER CARE Customer Care Explain the characteristics of Good Customer Service Describe the factors for customer satisfaction List the types of Customer Services List key elements of customer care Outline and explain the basic need of customer Learning Objectives Definition Customer service philosophy 1. Be Honest 2. Think Like Your Customers Customer Service Skills in Healthcare Active Listening to Your Patient 2. Cheerful and Lively Employee 3. Creating a Positive Emotion 4. Know how to Apologize 5. Be Professional anytime 5 most important customer service skills in hospitality #1: Customer Service skills # 2: Customer Service skills # 3: Customer Service skills # 4: Customer Service Elements #1: Elements # 2: Elements # 3: Five (5) Customer Service Principles for Healthcare # 1: Customer Service Principles # 2: Customer Service Principles # 3: Customer Service Principles # 4: Customer Service Principles # 5: CUSTOMER CARE PRINCIPLES OF CUSTOMER CARE USED IN ENHANCING PATIENT SATISFACTION IN OPTOMETRY SETTING Customer Care In an optometry setting, the terms are adapted to a healthcare context where patients are also customers receiving professional services. Customer: A patient or client who seeks eye care services, such as eye examinations, prescription glasses/contact lenses, or treatment for eye conditions. They "purchase" expertise, time, and products while expecting quality health outcomes. Customer care: The comprehensive support and attention provided to patients throughout their interaction with the optometry practice, from scheduling to post-visit follow-up. It focuses on building relationships, addressing needs empathetically, and ensuring a positive experience to promote eye health and loyalty. Customer satisfaction: The patient's perception that their expectations have been met or exceeded in terms of clinical care, service quality, communication, and overall experience. High satisfaction leads to better adherence to recommendations (e.g., wearing prescribed glasses), positive reviews, referrals, and repeat visits. Define the terms; customer, customer care, and customer satisfaction Explain the characteristics of Good Customer Service Good customer service in optometry is professional, empathetic, and patient-focused. Key characteristics include: Friendliness and Approachability — Warm greetings, smiles, and a welcoming environment to reduce anxiety about eye exams. Empathy and Active Listening — Understanding patient concerns (e.g., fear of vision loss) and responding with compassion. Professionalism and Competence — Accurate diagnoses, clear explanations, and ethical practices. Responsiveness — Prompt appointments, quick resolution of queries, and minimal wait times. Personalization — Tailoring services to individual needs (e.g., frame selection based on lifestyle). Reliability — Consistent quality, follow-through on promises (e.g., timely reminders for annual checks). Courtesy and Respect — Using patient-preferred names, maintaining privacy, and valuing their time. These traits build trust and differentiate the practice. Describe the factors for customer satisfaction Factors influencing patient satisfaction in optometry include: Clinical Outcomes → Accurate prescriptions, effective treatments, and improved vision. Communication → Clear explanations of results, procedures, and costs; answering questions thoroughly. Staff Attitude and Behavior → Friendly, respectful interactions from reception to optometrist. Practice Environment → Clean, comfortable waiting areas, modern equipment, and easy accessibility. Wait Times and Efficiency → Short delays, streamlined check-in/out, and convenient scheduling. Value for Money → Transparent pricing, quality products (frames/lenses), and perceived fairness. Personal Touch → Follow-up calls, personalized recommendations, and addressing individual concerns (e.g., pediatric or senior needs). Convenience → Online booking, reminders, and flexible payment options. Meeting these leads to higher satisfaction scores, loyalty, and positive word-of-mouth. List the types of Customer Services In optometry, customer services can be categorized as: Pre-Service: Appointment scheduling, reminders, and pre-visit information (e.g., what to expect). During-Service: Reception greeting, eye examination, frame selection assistance, and on-site adjustments. Post-Service: Follow-up calls/checks, warranty support for glasses, and feedback collection. Technical/Clinical Service: Professional eye health assessments and treatments. Retail Service: Product sales (glasses, contacts, accessories) with styling advice. Supportive Service: Handling complaints, insurance processing, and referrals to specialists. Digital Service: Online portals for records, virtual consultations, or ordering supplies. List key elements of customer care Key elements essential for effective customer care in optometry: Communication: Clear, empathetic, and jargon-free interactions. Empathy and Respect: Understanding patient emotions and treating them with dignity. Professionalism: Knowledgeable staff adhering to ethical standards. Accessibility: Easy booking, inclusive services (e.g., for disabilities), and convenient hours. Personalization: Customized care plans and product recommendations. Efficiency: Timely service without rushing the patient. Feedback Mechanisms: Surveys or open channels to improve services. Teamwork: Coordinated efforts among staff for seamless experiences. Outline and explain the basic need of customer According to Maslow's hierarchy adapted to customer needs (or general service models), basic needs in optometry include: Physiological/Safety Needs: Accurate eye care to protect vision health; safe, hygienic procedures. Security and Trust: Confidence in the optometrist's expertise, data privacy, and reliable outcomes. Belonging and Esteem: Feeling welcomed, respected, and valued (e.g., personalized attention boosts self-esteem). Information and Understanding: Clear education about eye conditions and options. Convenience and Comfort: Minimal discomfort during exams, easy access, and supportive environment. Resolution of Problems: Quick handling of issues like ill-fitting glasses. Meeting these foundational needs ensures patients feel secure and cared for, paving the way for higher satisfaction and loyalty. CUSTOMER CARE Learning Objectives By the end of this session students should be able to: Define Customer Care Describe Customer Care Philosophy Describe the Customer Service Skills in Healthcare Describe five Customer Service Principles for Healthcare Definition Customer Care: Treating customers with respect and kindness and building an emotional connection with them to ensure their satisfaction with your services. It’s about meeting their emotional needs and fostering relationships. It’s something that can, and should be, handled by everyone. Customer service philosophy Summarized by the word “APPLE”. Approach customers with a personalized, warm welcome. Probe politely to understand all the customer's needs. Present a solution for the customer. Listen for and resolve any issues or concerns. End with a fond farewell and an invitation to return.” 1. Be Honest While we, of course, want to make our customers happy, we don’t take a “solve every possible issue to delight customers” approach: be honest. 2. Think Like

Communication and Life Skills, Optometry Notes, Optometry Semester 1

Communication And Life Skills

OPTOMETRY · SEMESTER 1 Communication And Life Skills Communication and Life Skills START READING NOTES Contents of This Topic Session 1. learning objectives Definition of Communication Importance of Communication Management Office Therefore Communication is necessary to: Different Methods/Forms of Communication Communication can either be: People often say one thing but seem to feel a different way Communication can also be categorised according to the nature of the communication process, as follows: Evaluation 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 38 39 40 41 42 43 44 45 46 47 48 Session 1. Introduction to Communication Skills 1 learning objectives Explain the importance of communication Describe different forms of communication Describe different methods of communication 2 Definition of Communication Communication Process in which message is conceived, organised, transmitted, received and responded to OR Process of exchanging information, thoughts, feeling , idea, instructions or knowledge Effective Communication Process in which message is effectively conceived, organised, transmitted, received and responded to 3 Importance of Communication 4 Management Helps in building effective relationship within an organization. Without timely communication of accurate information, management cannot effectively conduct its function of organizing, directing, controlling and coordinating the activities of organization Helps in relationship outside organization in order to maintain its external relationships 5 Office It helps office to receive, record and process information It helps to communicate the processed information to the management so as to make timely decision It helps the office to communicate the management decision to different levels of staff and outsiders 6 Therefore Communication is necessary to: Share knowledge and experiences Build relationships Motivate Inform Teach Persuade Entertain Inspire Giving or receive direction 7 Different Methods/Forms of Communication 8 Communication can either be: Verbal: through spoken words Non-verbal Gestures (smiling, leaning forward, nodding) The way we stand The way we sit Facial expressions Silence Eye contact 9 People often say one thing but seem to feel a different way Crying while saying, ‘I am fine’ Saying that you are listening when you are not making eye contact with the speaker and you are looking all around the room while the speaker is talking Saying that you are not bored or tired when you are yawning 10 Communication can also be categorised according to the nature of the communication process, as follows: Interpersonal communication: it involves more than one individual; it may be between two people or among many people. For example in group meetings, interviews, conversation among individuals or memos to members of staff. Intrapersonal Occurs within an individual Involves thoughts, feelings, and the way a person looks at himself/herself Sender and receiver are the same person The channel is the individual’s brain, processing the thoughts and feelings 11 Evaluation What is communication? What is effective communication? What is the importance of communication? What are the forms of communication 12 13 session 2. Media of Communication 14 learning objectives Define media of communication Explain types of communication media Explain advantages and disadvantages of communication media Describe factors influencing choice/selection of communication media 15 Media of communication are those channels that the message passes to get to the target receiver or audience. 16 Types of Media of Communication Some of the commonly used media are; Written medium: Involve transmitting a message in a written form, for examples; Books, articles, letters, newspapers, memos, reports, email, notes,short text messages and social media Visual medium: Relies on the eye for impression and information, for examples; use of diagrams, symbols, posters, pictures, billboards, projected images and sign languages 17 Media of communication cont……………………. Oral medium: Message is passed by words of mouth, for examples; Telephone calls, face to face conversation, radio broadcast, group discussion and speeches Audio medium: This involves electronic media employing sound signals, for example the use of radio Audio-visual medium: This involves electronic media employing a combination of sight and sound signals (Audience can see and hear), for examples; Television, teleconferencing and films 18 Advantages and Disadvantages of Communication Media 19 Written medium Advantages: It provides a permanent record of information It is widely accessed compared to other media Facilitates organisational performance by standardisation of standards, formalisation of appointments and delegation of duties It binds legally-whatever is agreed in on, put in writing and signed becomes a formal commitment supported by the Laws Disadvantages: Costly in terms of time, energy, material and logistics Quick clarification is not available (feedback) Requires skills and competence in the use of language and vocabulary 20 Visual medium Advantages: Wide reach Simple, high status with standardised meaning Saves time Disadvantages: They are risky-based on the trust that the audience has a capacity to interpret signs intended by a sender 21 Oral medium Advantages: Provides high level of understanding and transparency Flexible- adjustments and changes can be done during presentation Feedback can be given immediately It is cheap It is a common medium used in conflict resolution It promote friendly relation Better medium for transmitting private and confidential information 22 Disadvantages of oral medium Has no immediate permanent records, It rely only on oral communication which may not be sufficient in business settings 23 Audio medium Advantages: Medium to wide reach High status Good for simple messages and slogans Relatively inexpensive (compared to Audio-visual media Can help to generate interests, awareness and excitement Disadvantages Programmes not always on at convenient times No room for interaction Audio only, no visual communication 24 Audio-visual medium Advantages: Self-sufficient-it employs visual image back-up for audio presentation It has long lasting impact (images aid retention) It has broader catchment Disadvantages: Limited chances for clarification and feedback Risks of communication breakdown Expensive Not everyone has a television set 25 Factors Influencing Choice of Communication Media 26 Reliability Effective communication is that which links the sender and the audience well. One should consider the channel chosen is reliable. For example it is pointless to send a message that will not be delivered to the intended recipient. Receiver The choice

Communication and Life Skills, Optometry Notes, Optometry Semester 1

Communication Skills and Customer Care

OPTOMETRY · SEMESTER 1 Communication Skills and Customer Care Communication and Life Skills START READING NOTES Contents of This Topic CHAPTER ONE; RELATED TASK Introduction Effective communication: Components of effective communication process. Core Components of the Process Characteristics of effective communication Communication Skills and Customer Care Types of effective communication Methods of effective communication Flow of effective communication. Providing feedback Appropriate Means of Providing Feedback Key Points COMMUNICATION SKILLS AND CUSTOMER CARE CHAPTER ONE; DESCRIBE CONCEPTS OF COMMUNICATION SKILLS IN MANAGING CLIENTS. RELATED TASK At the end of this chapter you should be able to describe the following; Define effective comm and comm process Outline components of effective communication process. Explain types of effective communication process Explain methods of effective communication Describe flow of effective communication Explain ways of providing feedback Explain barriers of effective communication. Introduction Communication Process in which message is conceived, organised, transmitted, received and responded to. OR Process of exchanging information, thoughts, feeling , idea, instructions or knowledge Effective Communication Process in which message is effectively conceived, organised, transmitted, received and responded to. Effective communication: “Effective communication is defined as good working relationships between the client and the health professional. Through effective communication a client feels respected and understood, understands recommendations from the clinical staff and client feels motivated to return to the clinic. Effective communication skills: Effective communication skills is defined as “ability to use and employ all components of communication skills in relating to a client satisfaction” Effective communication skill is essential to the promotion of quality health care Components of effective communication process. The component of communication are chain to impact the information from one person to others and the components are: Core Components of the Process Sender/Source: The originator of the message, who encodes ideas into words or symbols. Message: The information, idea, or feeling being conveyed. Encoding: The sender's process of converting thoughts into a transmittable form (words, gestures). Medium/Channel: The pathway the message travels (face-to-face, email, phone). Receiver/Decoder: The person who gets the message and interprets it. Decoding: The receiver's process of interpreting the encoded message. Feedback: The receiver's response, indicating understanding or confusion, completing the loop. Context: The surrounding situation, culture, or environment that influences the message Characteristics of effective communication Just delivering a message is not enough; it must meet the purpose of the sender. Keeping this in mind, let us discuss the elements which make communication effective: Clear Message: The message which the sender wants to convey must be simple, easy to understand and systematically framed to retain its meaningfulness. Correct Message: The information communicated must not be vague or false in any sense; it must be free from errors and grammatical mistakes. Complete Message: Communication is the base for decision making. If the information is incomplete, it may lead to wrong decisions. Precise Message: The message sent must be short and concise to facilitate straightforward interpretation and take the desired steps Communication Skills and Customer Care Reliability: The sender must be sure from his end that whatever he is conveying is right by his knowledge. Even the receiver must have trust on the sender and can rely on the message sent. Consideration of the Recipient: The medium of communication and other physical settings must be planned, keeping in mind the attitude, language, knowledge, education level and position of the receiver. Sender’s Courtesy: The message so drafted must reflect the sender’s courtesy, humbleness and respect towards the receiver.( showing respect and build positive relationship) Types of effective communication Verbal: Using spoken words, including tone and vocal inflection, to convey messages (e.g., conversations, presentations). Non-verbal: Communicating through body language, facial expressions, eye contact, posture, and gestures, often supporting or even contradicting verbal messages. Written: Transmitting information through text, such as emails, reports, texts, or social media posts. Visual: Using visual aids like images, charts, graphs, infographics, and symbols to communicate clearly. Listening (or Auditory): The active process of receiving, interpreting, and responding to spoken messages, often overlooked but vital. Methods of effective communication Core Methods & Skills Active Listening: Pay full attention, understand the message, ask clarifying questions, avoid interrupting, and give encouraging cues. Clarity & Conciseness: Be direct, simple, and to the point; avoid jargon to ensure your message is easily understood. Non-Verbal Cues: Be aware of your body language, facial expressions, eye contact, and tone of voice, as they often speak louder than words. Empathy: Try to see things from the other person's perspective and acknowledge their feelings to build connection. Audience Awareness: Tailor your message, tone, and approach to suit who you are speaking with. Flow of effective communication. Effective communication flows as a dynamic cycle: a sender encodes a clear, concise message, chooses a channel, and sends it; a receiver decodes and interprets it, ideally offering feedback, which loops back to the sender, ensuring mutual understanding through active listening, empathy, and awareness of non-verbal cues for successful information exchange and goal achievement. Providing feedback Feedback in Communication Feedback means communicating with other person by providing information on how you interpret his/her message Importance of Feedback in Communication Support and confirms positive (desired) behavior. The other person is encouraged to keep behaving that way Can correct negative (undesirable) behavior. The other person is invited to change behavior Clarifies interpersonal relations; it increases understanding between people and assist in improving their cooperation. Appropriate Means of Providing Feedback Verbal or non- verbal o ‘’I like this from you’’ can have the same meaning as a raised thumb or a nod of Approval Conscious or unconscious o A remark like ‘’this is boring’’ is consciously made, yawning is mostly done without being aware Spontaneous (voluntary) or on request o Some people give their opinion on their own initiative while others have to be asked what they think about it. Formal or informal o Applause (praise by clapping or cheers) in a theatre is a form of formal feedback because it is part of the show. A pat on the back is informal Key Points Feedback means communicating

Human Anatomy and Physiology, Optometry Notes, Optometry Semester 1

Respiratory System Part C

OPTOMETRY · SEMESTER 1 Respiratory System Part C Human Anatomy and Physiology START READING NOTES Contents of This Topic Functional residual capacity Total lung capacity Inspiratory capacity Dead spaces Physiological dead space Alveolar ventilation Introduction Factors regulating respiration Physiological variables affecting Respiratory membrane Factors that affect the rate of gas diffusion Functional residual capacity Functional residual capacity – the amount of air remaining in the lungs at the end of a normal expiration, therefore it is the sum of ERV + RV = 2.2 -2.4 litres. 2 Total lung capacity Total lung capacity – the sum of all four lung volumes – the total amount of air a lung can hold i.e. = TV+ IVR + EVR + RV = 5.7 – 6.2 litres. 3 Inspiratory capacity Inspiratory capacity is the Tidal volume plus the inspiratory reserve volume 4 Dead spaces Anatomical dead space – air in passageway that do not participate in gas exchange. Dead space:since gaseous exchange in the respiratory system occurs only in the terminal portions of the airways, the gas that occupies the rest of the respiratory system is not available for gas exchange with pulmonary capillary blood. This gas is known to be in dead space 5 Dead spaces Dead space can be: Anatomical dead space – anatomical dead space is the gas in the conducting areas of the respiratory system, such as the mouth, trachea and bronchi where the air doesn't come to the alveoli of the lungs, that do not participate in gas exchange Physiological dead space. 6 Physiological dead space The physiological dead space is equal to the anatomical dead space plus the alveolar dead space Alveolar dead space is the area in the alveoli that does get air to be exchanged, but there is no enough blood flowing through the capillaries for exchange to be effective It is normally very small (less than 5 mL) in healthy individuals. It can increase dramatically in some lung diseases 7 Physiological dead space Physiologic dead space can be measured by Bohr's method. An equation and example are provided below: In physiology, dead space is air that is inhaled by the body in breathing, but does not partake in gas exchange. In adults, it is usually in the range of 150 mL. 8 Alveolar ventilation Alveolar ventilation is the volume of new air that moves into and out of the alveoli per minute. It is equal to the tidal volume minus the anatomical dead space, multiplied by the respiratory rate: 9 Alveolar ventilation Alveolar ventilation per minute is the total volume of new air entering the alveoli and adjacent gas exchange areas each minute. Alveolar ventilation is one of the major factors determining the concentrations of oxygen and carbon dioxide in the alveoli. 10 11 12 FACTORS REGULATING RESPIRATION Introduction Control of respiration is normally involuntary. Voluntary control is exerted during activities such as speaking and singing but is overridden if blood CO2 rises (hypercapnia) 14 Factors regulating respiration The respiratory centre: This is formed by groups of nerve cells that control the rate and depth of respiration They are situated in the brain stem, in the medulla oblongata and the pons influence respiration 15 Factors regulating respiration Central chemoreceptors: These are on the surface of the medulla oblongata and are bathed in cerebrospinal fluid. When the arterial PCO2 rises (hypercapnia), the central chemoreceptors respond by stimulating the respiratory centre, increasing ventilation of the lungs and reducing arterial PCO2. The sensitivity of the central chemoreceptors to raised arterial PCO2 is the most important factor in maintaining homeostasis of blood gases in health. 16 Factors regulating respiration 17 Factors regulating respiration Peripheral chemoreceptors: These are situated in the arch of the aorta and in the carotid bodies They are more sensitive to small rises in arterial PCO2 than Nerve impulses, generated in the peripheral chemoreceptors, are conveyed by the glossopharyngeal and vagus nerves to the medulla and stimulate the respiratory centre. The rate and depth of breathing are then increased. An increase in blood acidity stimulates the peripheral chemoreceptors, resulting in increased ventilation, increased CO2 excretion and increased blood pH. 18 Factors regulating respiration Breathing may be modified by the higher centres in the brain by: speech, singing emotional displays, e.g. crying, laughing, fear drugs, e.g. sedatives, alcohol Sleep Temperature influences breathing: In fever respiration is increased due to increased metabolic rate while in hypothermia it is depressed, as is metabolism. Temporary changes in respiration occur in swallowing, sneezing and coughing. 19 Factors regulating respiration In strenous exercise, both the rate and depth of breathing increase, increasing oxygen uptake and carbon dioxide excretion in order to meet increased needs. 20 Physiological variables affecting respiration Elasticity. Elasticity is the term used to describe the ability of the lung to return to its normal shape after each breath. Loss of elasticity of the connective tissue in the lungs necessitates forced expiration and increased effort on inspiration 21 Physiological variables affecting respiration Compliance. This is a measure of the distensibility of the lungs, i.e. the effort required to inflate the alveoli. When compliance is low the effort needed to inflate the lungs is greater than normal, e.g. in some diseases where elasticity is reduced or when insufficient surfactant is present. It should be noted that compliance and elasticity are opposing forces. 22 Factors regulating respiration Airflow resistance. When this is increased, e.g. in bronchoconstriction, more respiratory effort is required to inflate the lungs. 23 GAS EXCHANGE THROUGH RESPIRATORY MEMBRANES Respiratory membrane 25 Respiratory membrane The respiratory membrane has the following layers : 1. A layer of fluid lining the alveolus and containing surfactant that reduces the surface tension of the alveolar fluid 2. The alveolar epithelium composed of thin epithelial cells 3. An epithelial basement membrane 26 Respiratory membrane 4. A thin interstitial space between the alveolar epithelium and the capillary membrane 5. A capillary basement membrane that in many places fuses with the alveolar epithelial basement membrane 6. The capillary endothelial membrane 27 Factors that affect the

Human Anatomy and Physiology, Optometry Notes, Optometry Semester 1

Respiratory System Part B

OPTOMETRY · SEMESTER 1 Respiratory System Part B Human Anatomy and Physiology START READING NOTES Contents of This Topic Transport of Oxygen in Blood Stream Transport of Carbon Dioxide in Blood Stream Breathing Thoracic diaphragm 17 Inspiration(1) Inspiration(2) 20 Expiration(1) Expiration(2) Expiration(3) A Spirometer Spirometry Pulmonary Volumes Pulmonary Capacities Vital capacity Transport of Oxygen in Blood Stream The pH of blood falls as its CO2 content increases, so that when the PCO2 rises, the curve shifts to the right. In active tissues there is increased production of carbon dioxide and heat, which leads to increased release of oxygen. In this way oxygen is available to tissues in greatest need. When oxygen leaves the erythrocyte, the deoxygenated haemoglobin turns purplish in colour. 2 Transport of Oxygen in Blood Stream The affinity of fetal hemoglobin (hemoglobin F) for O2, which is greater than that for adult hemoglobin (hemoglobin A), facilitates the movement of O2 from the mother to the fetus 3 Transport of Carbon Dioxide in Blood Stream Carbon dioxide is one of the waste products of metabolism It is excreted by the lungs and transported in three mechanisms As bicarbonate ions (HC03-) in the plasma (70%) Some is carried in erythrocytes, loosely combined with haemoglobin as carbaminohaemoglobin (23 %) Some is dissolved in the plasma (7%) 4 Transport of Carbon Dioxide in Blood Stream The solubility of CO2 in blood is about 20 times that of O2; therefore considerably more CO2 than O2 is present in simple solution at equal partial pressures The CO2 that diffuses into red blood cells is rapidly hydrated to H2CO3 because of the presence of carbonic anhydrase 5 Transport of Carbon Dioxide in Blood Stream The H2CO3 dissociates to H+ and HCO3–, and the H+ is buffered, primarily by hemoglobin, while the HCO3– enters the plasma Some of the CO2 in the red cells reacts with the amino groups of hemoglobin and other proteins (R), forming carbamino compounds Since deoxygenated hemoglobin binds more H+ than oxyhemoglobin does and forms carbamino compounds more readily, binding of O2 to hemoglobin reduces its affinity for CO2 (This is known as Haldane effect) 6 Transport of Carbon Dioxide in Blood Stream Venous blood carries more CO2 than arterial blood, CO2 uptake is facilitated in the tissues, and CO2 release is facilitated in the lungs About 7-11% of the CO2 added to the blood in the systemic capillaries is carried to the lungs as carbamino-CO2 In the plasma, CO2 reacts with plasma proteins to form small amounts of carbamino compounds, and small amounts of CO2 are hydrated; but the hydration reaction is slow in the absence of carbonic anhydrase 7 Transport of Carbon Dioxide in Blood Stream Carbon dioxide from tissue diffuses into red blood cells within the capillaries Some of the carbon dioxide binds to haemoglobin, but most of it reacts with water inside the red cells to form carbonic acid, a reaction catalyzed by carbonic anhydrase The carbonic acid then dissociates to form bicarbonate and hydrogen ions 8 Transport of Carbon Dioxide in Blood Stream Since the rise in the HCO3– content of red cells is much greater than that in plasma as the blood passes through the capillaries, about 70% of the HCO3– formed in the red cells enters the plasma The excess HCO3– leaves the red cells in exchange for Cl– This exchange is called the chloride shift 9 Transport of Carbon Dioxide in Blood Stream Because of it, the Cl– content of the red cells in venous blood is therefore significantly greater than in arterial blood The chloride shift occurs rapidly and is essentially complete in 1 second 10 MECHANISM OF INHALATION AND EXHALATION Breathing Breathing (Ventilation): Breathing supply oxygen to the alveoli and eliminate carbon-dioxide Expansion of the chest during inspiration occurs as a result of muscular activity, partly involuntary and partly voluntary. The main muscles used in normal breathing are the intercostals muscles and the diaphragm There are eleven pairs of intercostals muscles that occupy the spaces between the 12 pairs of ribs. 12 Breathing The average respiratory rate is 12 to 15 breaths per minute Each breath consists of three phases Inspiration Expiration Pause 13 Breathing During difficult or deep breathing, muscles of the neck, shoulders and abdomen assist in respiration. These muscles are: sternocleidomastoid and scaleneus muscles- anterior, middle and posterior 14 Thoracic diaphragm The diaphragm is a dome-shaped musculo-fibrous septum which separates the thoracic cavity from the abdominal cavity, its convex upper surface forming the floor of the former, and its concave under surface the roof of the latter. The diaphragm is pierced by a series of apertures to permit of the passage of structures between the thorax and abdomen. 15 Thoracic diaphragm There are three large openings (diaphragmatic hiatus): the aortic the esophageal and the vena cava openings The clinical importance of oesophageal opening is that; weakness can occur and this can cause the development of hiatus hernia The diaphragm is crucial for breathing and respiration The diaphragm is innervated by the phrenic nerve 16 17 Inspiration(0) Inspiration(1) During inspiration, the diaphragm contracts and moves downwards while the external intercostals muscles contracts raising the ribs and elevate the sternum, increasing the size of the thoracic cavity even more This causes expansion of the lungs, as a result, the intra-alveolar pressure falls and the atmospheric pressure forces more air into the airways 18 Inspiration(2) The process of inspiration is active, as it needs energy for muscle contraction. This process is enhanced by the following: Compliance; ability of pulmonary tissue to stretch, making inspiration possible The pressure between parietal and visceral pleura is always less than atmospheric pressure. Elastic coil – tendency of pulmonary tissue to return to a smaller size after having been stretched, passively during expiration 19 20 Expiration(0) Expiration(1) During expiration, the diaphragm and intercostals muscles relax, causing the lungs to recoil, and return to the original shape. This increases the intra-alveolar pressure above the atmospheric pressure, so the air inside the lungs is forced out through the

Human Anatomy and Physiology, Optometry Notes, Optometry Semester 1

Respiratory System Part A

OPTOMETRY · SEMESTER 1 Respiratory System Part A Human Anatomy and Physiology START READING NOTES Contents of This Topic Learning Objectives Introduction The Function of the Nose Functions of the pharynx Function of larynx Types of respiration External Respiration Internal Respiration Transport of Oxygen in Blood Stream Oxygen-Haemoglobin Dissociation Curve RESPIRATORY SYSTEM PHYSIOLOGY Learning Objectives 3 Mention the functions of respiratory passageways Explain the types of respiration Describe the mechanism of inhalation and exhalation Describe pulmonary volumes and capacities Learning Objectives Explain alveolar ventilation Describe principles of gas exchange through respiratory membranes Describe transport of oxygen and carbon dioxide between lungs and tissues Describe factors regulating respiration 4 FUNCTIONS OF RESPIRATORY PASSAGEWAYS Introduction The respiratory system is divided into two divisions Upper respiratory tract The organs are located outside of the thorax and consists of the nose, pharynx and larynx Lower respiratory tract The organs are located within the thorax and consists of the trachea, the bronchial tree and the lungs 6 Introduction The main role of the respiratory system is to provide gas exchange between the blood and the environment. Primarily, oxygen is absorbed from the atmosphere into the body and carbon dioxide is expelled from the body. The following are organs from the respiratory system Nose Pharynx Larynx Trachea Bronchi Lungs 7 8 9 The Function of the Nose Respiration (breathing) The nose is the first part of the respiratory system through which the inspired air passes The nose humidify, warming, filtering and cleaning of air Reception and elimination of secretions from the nasal mucosa, paranasal sinuses, and nasolacrimal ducts Olfaction (smelling) The nose is the organ of sense of smell It aids speech- this is enhanced by the presence of paranasal sinuses, which act as resonating chambers for speech 10 Functions of the pharynx Passageway for air and food Warming and humidifying air Protection Taste Facilitates Hearing The pharynx is also important in vocalization and Speech 11 Function of larynx Respiration filters, humidifies and warms air as it passes to the lungs. Swallowing The epiglottis and vestibular folds prevent swallowed material from moving into the larynx Phonation; the vocal folds are the primary source of sound production 12 TYPES OF RESPIRATION Types of respiration Respiration:The exchange of gases between body cells and the environment It involves: Breathing (pulmonary ventilation) Ventilation is the process of moving air into the lungs (inspiration) and out of the lungs (expiration) The flow of air in and out of the lungs require pressure gradient in the opposite direction Exchange of gases in the lungs: external respiration and in the tissues: internal respiration. 14 External Respiration 15 External Respiration External respiration: An exchange of gases by diffusion between the alveoli and the blood in the alveolar capillaries, across the respi­ratory membrane Each alveolar wall is one cell thick and is surrounded by a network of tiny capillaries (the walls of which are also only one cell thick) 16 External Respiration Venous blood arriving at the lungs has travelled from all the tissues of the body, and contains high levels of CO2 and low levels of O2 Carbon dioxide diffuses from the blood down its concentration gradient into the alveoli until equilibrium with alveolar air is reached. By the same process, oxygen diffuses from the alveoli into the blood 17 External Respiration The PO2 within alveoli averages approximately 104mmHg, and as blood flows into the pulmonary capillaries, it has a PO2 of approximately 40mmHg. Consequently, oxygen diffuses from the alveoli into the pulmonary capillary blood because the PO2 is greater in the alveoli than in the capillary blood. 18 External Respiration The slow flow of blood through the capillaries increases the time available for gas exchange to occur. When blood leaves the alveolar capillaries, the oxygen and carbon dioxide concentrations are in equilibrium with those of alveolar air 19 Internal Respiration Internal respiration: An exchange of gases by diffusion between blood in the capillaries and the body cells Gaseous exchange does not occur across the walls of the arteries carrying blood from the heart to the tissues, because their walls are too thick. P02 of blood arriving at the capillary bed is therefore the same as blood leaving the lungs 20 Internal Respiration Blood arriving at the tissues has been cleansed of its CO2 and saturated with O2 during its passage through the lungs, and therefore has a higher P02 and a lower PC02 than the tissues. Carbon dioxide is continually produced as a by-product of cellular respiration, and a diffusion gradient is established from tissue cells to the blood within the tissue capillaries. 21 Internal Respiration The intracellular Pco2 is approximately 46mmHg, and the interstitial fluid Pco2 is approximately 45 mmHg. At the arterial end of the tissue capillaries, the Pco2 is a close to 40 mmHg. As blood flows through the tissue capillaries, carbon dioxide diffuses from a higher Pco2 to a lower Pco2 until equilibrium in Pco2 is established. 22 Internal Respiration At the venous end of the capillaries, blood has a Pco2 of 45 mmHg. CO2 diffuses from the cells into the extracellular fluid, then into the bloodstream towards the venous end of the capillary. 23 TRANSPORT OF OXYGEN AND CARBON DIOXIDE BETWEEN LUNGS AND TISSUES Transport of Oxygen in Blood Stream Transport of blood oxygen and carbon dioxide is essential for internal respiration to occur. Oxygen is carried in the blood in: Chemical combination with haemoglobin as oxyhaemoglobin (98.5%) Solution in plasma water (1.5%). 25 Transport of Oxygen in Blood Stream The amount of O2 in the blood is determined by the amount of dissolved O2, the amount of hemoglobin in the blood, and the affinity of the hemoglobin for O2. In normal adults, most of the hemoglobin molecules contain two alpha and two beta chains Heme 26 Transport of Oxygen in Blood Stream Each of the four iron atoms can bind reversibly one O2 molecule. The iron stays in the ferrous state, so that the reaction is an oxygenation, not an oxidation The reaction is rapid, requiring

Human Anatomy and Physiology, Optometry Notes, Optometry Semester 1

Renal Physiology

OPTOMETRY · SEMESTER 1 Renal Physiology Human Anatomy and Physiology START READING NOTES Contents of This Topic INTRODUCTION Renal Physiology INTRODUCTION CONT… FUNCTIONS OF URINARY SYSTEM functions CONT … Kidneys External Anatomy of the Kidney Internal Anatomy of the Kidney Internal Anatomy of the Kidney CONT … Blood Supply of the Kidneys Kidneys CONT … The nephron The nephron CONT … Cortical Nephron Juxtamedullary Nephron Juxtaglomerular Apparatus Juxtaglomerular Apparatus CONT … Formation of urine Formation of urine CONT … Filtration Filtration AND FILTRATION PRESSURES Blood constituents in glomerular filtrate Blood constituents remaining in glomerular capillaries Selective reabsorption Selective reabsorption CONT … Hormones that influence selective reabsorption Hormones that influence selective reabsorption CONT … Atrial natriuretic peptide Tubular secretion Renin–angiotensin–aldosterone system Renin–angiotensin–aldosterone system CONT … Micturition IN INFANTS Micturition IN INFANTS CONT … Micturition IN ADULTS Micturition IN ADULTS CONT … Extracellular Fluid Osmolarity Extracellular Fluid Osmolarity CONT … Components Affecting Extracellular Fluid Osmolarity Sodium and potassium balance Sodium and potassium balance cont … RENAL PHYSIOLOGY INTRODUCTION The urinary system is the main excretory system and consists of the following structures: 2 kidneys, which secrete urine 2 ureters, which convey the urine from the kidneys to the urinary bladder the urinary bladder where urine collects and is temporarily stored the urethra through which the urine passes from the urinary bladder to the exterior. Renal Physiology Urine is excreted from each kidney through its ureter and is stored in the urinary bladder until it is expelled from the body through the urethra. The specialized branch of medicine that deals with structure, function, and diseases of the male and female urinary systems and the male reproductive system is known as nephrology. The branch of surgery related to male and female urinary systems and the male reproductive system is called urology. INTRODUCTION CONT… INTRODUCTION CONT… The urinary system plays a vital part in maintaining homeostasis of water and electrolyte concentrations within the body. The kidneys produce urine that contains metabolic waste products, including the nitrogenous compounds urea and uric acid, excess ions and some drugs. FUNCTIONS OF URINARY SYSTEM The main functions of the urinary system and its components are to Regulate blood volume and composition (e.g. sodium, potassium and calcium) Regulate blood pressure. Regulate pH homeostasis of the blood. Contributes to the production of red blood cells by the kidney. Helps synthesize calcitrol the (active form of Vitamin D). Stores waste product (mainly urea and uric acid) before it and other products are removed from the body. functions CONT … The main functions of the kidneys are: Formation and secretion of urine, which regulates total body water, electrolyte and acid–base balance and enables excretion of waste products Production and secretion of erythropoietin, the hormone that stimulates formation of red blood cells Production and secretion of renin, an important enzyme in the control of blood pressure Kidneys The kidneys lie on the posterior abdominal wall, one on each side of the vertebral column, behind the peritoneum and below the diaphragm. They extend from the level of the 12th thoracic vertebra to the 3rd lumbar vertebra, receiving some protection from the lower rib cage, specifically11th & 12th ribs . The right kidney is usually slightly lower than the left, probably because of the considerable space occupied by the liver. External Anatomy of the Kidney Near the center of the concave medial border of the kidney is a vertical fissure called the hilus, through which the ureter leaves and blood vessels, lymphatic vessels, and nerves enter and exit. Three layers of tissue surround each kidney: the innermost renal capsule, the adipose capsule, and the outer renal fascia. Nephroptosis is an inferior displacement of the kidneys. It most often occurs in thin people. This condition is dangerous because the ureters may kink and block urine flow. Internal Anatomy of the Kidney Internally, the kidneys consist of cortex, medulla, pyramids, papillae, columns, calyces, and pelves. The renal cortex and renal pyramids constitute the functional portion or parenchyma of the kidney. The nephron is the functional unit of the kidney. Internal Anatomy of the Kidney CONT … Parenchyma of kidney renal cortex = superficial layer of kidney renal medulla inner portion consisting of 8-18 cone-shaped renal pyramids separated by renal columns renal papilla point toward center of kidney Drainage system fills renal sinus cavity cuplike structure (minor calyces) collect urine from the papillary ducts of the papilla minor & major calyces empty into the renal pelvis which empties into the ureter Internal Anatomy of the Kidney CONT … Blood Supply of the Kidneys Blood enters the kidney through the renal artery and exits via the renal vein. Kidneys CONT … Kidneys are bean-shaped organs, about 11 cm long, 6 cm wide, 3 cm thick and weigh 150 g. They are embedded in, and held in position by, a mass of fat. A sheath of fibrous connective tissue, also known as the renal fascia, encloses the kidney and the renal fat. The kidneys receive about 20% of the cardiac output. The nephron The nephron consists of a tubule closed at one end, the other end opening into a collecting tubule. The closed or blind end is indented to form the cup-shaped glomerular capsule (Bowman’s capsule), which almost completely encloses a network of tiny arterial capillaries, the glomerulus. The nephron CONT … The loop of Henle consists of a descending limb, a thin ascending limb, and a thick ascending limb. There are two types of nephrons that have differing structure and function. A cortical nephron usually has its glomerulus in the outer portion of the cortex and a short loop of Henle that penetrates only into the outer region of the medulla. A juxtamedullary nephron usually has its glomerulus deep in the cortex close to the medulla; its long loop of Henle stretches through the medulla and almost reaches the renal papilla. Cortical Nephron 80-85% of nephrons are cortical nephrons Renal corpuscles are in outer cortex and loops of Henle lie mainly in cortex Juxtamedullary Nephron 15-20% of nephrons are

Human Anatomy and Physiology, Optometry Notes, Optometry Semester 1

Physiology Of Digestive System

OPTOMETRY · SEMESTER 1 Physiology Of Digestive System Human Anatomy and Physiology START READING NOTES Contents of This Topic LEARNING OUTCOMES INTRODUCTION FUNCTIONAL ANATOMY OF DIGESTIVE SYSTEM FUNCTIONAL ANATOMY OF DIGESTIVE SYSTEM CONT … WALL OF DIGESTIVE SYSTEM WALL OF DIGESTIVE SYSTEM CONT .. FOOD INTAKE REGULATION FUNCTIONS OF DIGESTIVE SYSTEM FUNCTIONS OF DIGESTIVE SYSTEM CONT … MECHANISM OF SWALLOWING/DEGLUTITION MECHANISM OF SWALLOWING/DEGLUTITION CONT … SALIVA FUNCTIONS OF SALIVA FUNCTIONS OF SALIVA CONT … REGULATION OF SALIVARY SECRETION REGULATION OF SALIVARY SECRETION CONT … THE STOMACH AND GASTRIC JUICE CELLS LINING STOMACH CELLS LINING STOMACH CONT … STRUCTRE NERVE SUPPLY TO THE STOMACH FUNCTIONS OF THE STOMACH GASTRIC JUICE FUNCTIONS OF GASTRIC JUICE FUNCTIONS OF GASTRIC JUICE CONT … FOOD DIGESTION IN THE STOMACH REGULATION OF GASTRIC JUICE SECRETION CEPHALIC PHASE GASTRIC PHASE INTESTINAL PHASE GASTRIC SECRETION INHIBITION BY GI HORMONES FACTORS INFLUENCING GASTRIC SECRETION PANCREATIC EXOCRINE SECRETIONS COMPOSITION OF PANCREATIC JUICE FUNCTIONS OF PANCREATIC JUICE REGULATION OF PANCREATIC JUICE SECRETION PHASES OF PANCREATIC JUICE SECRETION HORMONES THAT STIMULATE AND INHIBIT PANCREATIC SECRETION NEURAL REGULATION OF PANCREATIC JUICE SECRETION BILE SALTS FUNCTIONS OF BILE SALTS REGULATION OF BILE SALTS SECRETION FUNCTIONAL ANATOMY OF SMALL INTESTINE FUNCTIONS OF SMALL INTESTINE INTESTINAL VILLI AND GLANDS OF SMALL INTESTINE PROPERTIES AND COMPOSITION OF SUCCUS ENTERICUS FUNCTIONS OF SUCCUS ENTERICUS REGULATION OF SECRETION OF SUCCUS ENTERICUS FUNCTIONAL ANATOMY OF LARGE INTESTINE STRUCTURE OF WALL OF LARGE INTESTINE SECRETIONS OF LARGE INTESTINE FUNCTIONS OF LARGE INTESTINE ABSORPTION IN SMALL AND LARGE INTESTINE KEY ABSORBED SUBSTANCES IN SMALL INTESTINE KEY ABSORBED SUBSTANCES IN SMALL INTESTINE CONT … LARGE INTESTINE: WATER AND ELECTROLYTE RECLAMATION LARGE INTESTINE: WATER AND ELECTROLYTE RECLAMATION CONT … DEFECATION Physiology Of Digestive System PATHWAY FOR DEFECATION REFLEX WHEN YOU START EATING FOODS WITHOUT LABELS, YOU NO LONGER NEED TO COUNT CALORIES FOR PHYSIOLOGY OF DIGESTIVE SYSTEM LEARNING OUTCOMES BY THE END OF THIS SESSION STUDENTS MUST ABLE TO: Describe propulsive and mixing movements of the alimentary canal Describe the mechanism of swallowing(deglutition) Describe composition, functions and regulation of secretion of saliva Describe composition, functions and regulation of secretion of gastric juice Describe composition, functions and regulation of secretion of pancreatic juice Describe composition, functions and regulation of secretion of bile Describe composition, functions and regulation of secretion of the small intestines Describe absorption in the small and large intestines PART I INTRODUCTION Digestion is defined as the process by which food is broken down into simple chemical substances that can be absorbed and used as nutrients by the body. Digestive process is accomplished by mechanical and enzymatic breakdown of food into simpler chemical compounds. While the terms Alimentary Canal and Gastrointestinal (GI) Tract are often used interchangeably to refer to the Digestive System, it's important to understand the distinction: the alimentary canal and GI tract are actually components (building blocks) of the broader Digestive System. FUNCTIONAL ANATOMY OF DIGESTIVE SYSTEM Digestive system is made up of gastrointestinal tract (GI tract) or alimentary canal and accessory organs, which help in the process of digestion and absorption GI tract is a tubular structure extending from the mouth, pass through the thorax, abdomen and pelvis and ends at the anus, with a length of about 30 feet. It opens to the external environment on both ends. GI tract is formed by two types of organs: Primary digestive organs. Accessory digestive organs FUNCTIONAL ANATOMY OF DIGESTIVE SYSTEM CONT … Primary Digestive Organs :are the organs where actual digestion takes place. i. Mouth ii. Pharynx iii. Esophagus iv. Stomach v. Small intestine vi. Large intestine 2. Accessory Digestive Organs: are those which help primary digestive organs in the process of digestion. Accessory digestive organs are: i. Teeth ii. Tongue iii. Salivary glands iv. Exocrine part of pancreas v. Liver vi. Gallbladder. FUNCTIONAL ANATOMY OF DIGESTIVE SYSTEM CONT … WALL OF DIGESTIVE SYSTEM In general, wall of the GI tract is formed by four layers which are from inside out: 1. Mucosa layer (Mucus Layer) 2. Submucus layer 3. Muscular layer 4. Serosa (Serous) or fibrous layer WALL OF DIGESTIVE SYSTEM WALL OF DIGESTIVE SYSTEM Mucosa is the innermost layer made up of three layers The inner epithelium Lamina propria Muscularis mucosae Submucosa,this layer is composed of connective tissue, it contains numerous small glands, blood vessels, and parasympathetic nerves that form the submucosal plexus (Meissner plexus) WALL OF DIGESTIVE SYSTEM CONT .. Muscular is thick layer of smooth muscle tissue which consists of inner circular layer and outer longitudinal layer Between the two layers of muscles there is a nervous plexus called myenteric plexus (Auerbach plexus) Serosa is the outermost layer of made up loose connective tissue (visceral peritoneum) FOOD INTAKE REGULATION Food intake and energy expenditure are key regulators of body weight In humans, food intake is an essential function that is coordinated by the gastrointestinal, endocrine and nervous systems to maintain energy homeostasis The food intake cycle stages are hunger, satiation and satiety Hunger is the desire to eat and it is described as an uncomfortable emptiness in the abdomen. Satiation refers to the sensation of fullness that results in meal termination. Satiety is the term given to the postprandial events that determine the timing for the next meal FUNCTIONS OF DIGESTIVE SYSTEM Digestive system plays the major role in the digestion and absorption of food substances. Thus, the functions of digestive system include: Ingestion or consumption of food substances Breaking them into small particles by Mastication. Transport of small particles to different areas of the digestive tract through Propulsion. Secretion of necessary enzymes and other substances for digestion Digestion of the food particles Absorption of the digestive products (nutrients) Removal of unwanted substances from the body. FUNCTIONS OF DIGESTIVE SYSTEM CONT … Ingestion; taking in food into the stomach through the oral cavity, although liquid can be introduced directly into the stomach by nasogastric tube. Mastication; is the process by which food taken into the mouth is chewed by the teeth and broken down into small particles. Digestive enzymes cannot easily penetrate solid food particles

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