Homeostasis and feedback Quiz
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5 questions, one answer each
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1. Which of these is an example of negative feedback?
- A. Oxytocin release in labour
- B. Sweating when core temperature rises
- C. Opening of sodium channels in an action potential
- D. Blood clotting cascade
2. Which structure detects changes in blood temperature?
- A. Medulla oblongata
- B. Cerebellum
- C. Hypothalamus
- D. Pituitary gland
3. What does vasoconstriction in skin arterioles do?
- A. Increases heat loss by radiation
- B. Decreases heat loss by radiation
- C. Increases sweating
- D. Increases evaporation
4. Why is positive feedback not used for homeostasis?
- A. It amplifies changes
- B. It is too slow
- C. It needs two receptors
- D. It cannot involve hormones
5. What is the effect of a temperature much above the optimum on enzymes?
- A. Increased substrate concentration
- B. Hydrogen bonds break and the enzymes denature
- C. Active sites become larger
- D. Enzymes become more specific