NATS1675 Survival and Homeostasis Review PDF

NATS1675 – REVIEW: Survival and Homeostasis – Topic Outline (L4) This review is only a summary of key points For details refer to lecture recordings, lecture notes, textbook, and activities 1. From Structural Organiza...

NATS1675 – REVIEW: Survival and Homeostasis – Topic Outline (L4) This review is only a summary of key points For details refer to lecture recordings, lecture notes, textbook, and activities 1. From Structural Organization to Life Process a. What are the life processes? (activities performed by body that enable life) b. What are their general functions? 2. Survival Needs – The Requirements of Life a. Dependant on the environment b. Five factors – What are they? Why are they important? 3. Homeostasis a. Definition b. Body systems and cells – what’s the relationship between them? c. Internal Environment i. extracellular fluid – interstitial fluid, plasma ii. intracellular fluid 4. Factors that are homeostatically regulated – some examples? 5. Homeostatic Control Mechanisms a. Three parts, their descriptions, their functions, some examples? i. Sensor – Receptor ii. Integrator – Control Centre – Regulator iii. Effector 6. Negative and Positive Feedback Systems a. Descriptions, negative versus positive – similarities and differences b. Negative Feedback i. Body temperature regulation – details as per lecture notes ii. Testosterone and Sperm Production – details as per lecture notes iii. Other examples? c. Positive Feedback i. Contractions during childbirth - details as per lecture notes ii. Other examples? 7. Feedforward Regulation Go to next page… © B. Barbara Czaban, Ph.D., Review: Survival and Homeostasis, NATS1675 1 Some Questions (not all may apply to the topics covered in this course, so just ignore them) (answers on last page – BUT try answering the questions first, before looking at the answers) 1. List the life processes 2. What are the 5 “environmental” requirements - for body survival? 3. What is extracellular fluid comprised of? 4. What is homeostasis? 5. List the 3 components of a homeostatic control mechanisms © B. Barbara Czaban, Ph.D., Review: Survival and Homeostasis, NATS1675 2 Answers to Questions (not all may apply to the topics covered in this course, so just ignore them) 1. Maintain boundaries Differentiation Metabolism Reproduction Digestion Absorption Excretion Assimilation Responsiveness Circulation Movement Respiration Growth 2. Nutrients (food) Oxygen Water Heat (stable body temperature Pressure 3. Plasma and interstitial fluid 4. Condition in which the body’s controlled internal environment REMAINS AT STEADY STATE despite changes inside & outside the body 5. 1. Receptor or Sensor – provides information about stimuli i. Monitors changes in a controlled condition ii. Responds to change in system iii. Sends input information - nerve impulses, chemical signals (hormones) 2. Control or Regulatory Centre – Integrator i. Sets range for a controlled condition (set point) ii. Evaluates input signal from receptors iii. Determines appropriate response iv. Generates output signal 3. Effector i. Body structure that receives output signal from a control centre ii. Produces a response (effect) that changes the controlled condition © B. Barbara Czaban, Ph.D., Review: Survival and Homeostasis, NATS1675 3