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Flashcards · Biology · Homeostasis

Maintaining a Constant Internal Environment

16 cards

  1. What is homeostasis?

    The regulation of the conditions inside the body, so that they stay constant.

  2. What is the normal body temperature?

    About 37 °C.

  3. Name three conditions that are controlled.

    Body temperature, blood glucose concentration and water content.

  4. Why does temperature need to be constant?

    The enzymes in the body work best at about 37 °C.

  5. Why does water content need to be constant?

    So that cells do not swell or shrink by osmosis.

  6. What are the three parts of a control system?

    A receptor, a coordination centre and an effector.

  7. What does a receptor do?

    Detects a change in a condition.

  8. What does a coordination centre do?

    Receives information and decides on the response.

  9. What does an effector do?

    Carries out the response.

  10. What is negative feedback?

    A response that reverses the change, and so returns the condition to normal.

  11. Give an example of an internal change.

    Eating a meal, or exercising.

  12. Give an example of an external change.

    A hot or cold day.

  13. Name two types of effector.

    Muscles and glands.

  14. Which tissue sends impulses in nervous control?

    Neurones.

  15. How does hormonal control differ from nervous control?

    It is slower, and it usually lasts for longer.

  16. Common mistake about homeostasis?

    Thinking a condition is held at one exact value. It is kept within narrow limits.