Physiological Homeostasis

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Physiological Homeostasis

  1. 1. Physiological Homeostasis SQA HIGHER BIOLOGY Unit 3: Control and Regulation
  2. 2. How do we regulate our water content ?
  3. 3. How do we control the sugar in our blood?
  4. 4. How do we regulate our temperature ?
  5. 5. Learning Content <ul><li>The principle of negative feedback: </li></ul><ul><ul><li>The need to maintain conditions within tolerable limits. </li></ul></ul><ul><li>Water content of blood and concentration of cell chemicals. </li></ul><ul><li>Glucose and energy needs of tissue. </li></ul><ul><li>Temperature: </li></ul><ul><ul><li>the importance of temperature to enzyme-controlled metabolic processes in the body. </li></ul></ul><ul><li>Endotherms and ectotherms. </li></ul>
  6. 6. Controlling our internal environment <ul><li>What is our internal environment? </li></ul><ul><li>Why does it need to be controlled? </li></ul>Internal Environment Water Concentration Blood Sugar Level Temperature Why? Why? Why? High Low High Low High Low
  7. 7. Physiological Homeostasis Physiological Homeo stasis <ul><li>What do these words mean? </li></ul>
  8. 8. Negative Feedback “… and who’s idea was it to ask for employee feedback?” What does negative feedback mean?
  9. 9. Negative Feedback <ul><li>Describe how a thermostat controls the temperature of a house. </li></ul><ul><li>How is this an example of a negative feedback mechanism? </li></ul><ul><li>In this example, </li></ul><ul><ul><li>What is the ‘ set point ’? </li></ul></ul><ul><ul><li>What is the ‘ control centre ’? </li></ul></ul><ul><ul><li>What is the ‘ effector ’? </li></ul></ul>
  10. 10. Osmoregulation <ul><li>What is meant by ‘osmoregulation’? </li></ul><ul><li>How does osmoregulation work in the human body? </li></ul><ul><ul><li>Produce a poster summarising these processes. </li></ul></ul>
  11. 11. Blood sugar level SQA HIGHER BIOLOGY <ul><li>What are the key organs in the regulation of blood sugar levels? </li></ul><ul><li>How do these organs control blood sugar? </li></ul><ul><ul><li>Summarise these processes as a poster. </li></ul></ul><ul><li>What role does the hormone adrenaline play in this? </li></ul><ul><li>What is diabetes ? </li></ul><ul><ul><li>What’s the difference between type I and type II diabetes? </li></ul></ul><ul><ul><li>How is diabetes treated? </li></ul></ul>
  12. 12. Body Temperature <ul><li>What is meant by ‘ectotherm’ and ‘endotherm’? </li></ul><ul><li>How is the hypothalamus involved in temperature regulation? </li></ul><ul><li>Where are thermoreceptors located? Why are there two locations? </li></ul><ul><li>Summarise the homeostatic processes involved in the regulation of body temperature. </li></ul>
  13. 13. Homeostasis <ul><li>What advantage does homeostatic mechanisms provide to organisms? </li></ul><ul><li>What occurs to organisms if exposed to extreme conditions for prolonged periods of time? </li></ul>

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