Principles of homeostasis and negative feedback Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Which is an example of negative feedback?
- A. Oxytocin causing stronger contractions that stimulate more oxytocin release
- B. Sweating that lowers blood temperature, so that sweating is reduced
- C. A rise in stretch causing a further rise in stretch
- D. A hormone that increases its own secretion
2. Why can a hormone affect only certain cells?
- A. Only target cells have receptors complementary to its shape
- B. The hormone is carried only to target cells in the blood
- C. Only target cells have nuclei
- D. The hormone is broken down by all other cells
3. A blood glucose concentration that is too high would cause:
- A. Cells to take in more water by osmosis
- B. Cells to produce too much ATP
- C. Water to leave cells by osmosis as the blood water potential falls
- D. An increase in the pH of the blood
4. Which statement about the effect of pH on enzymes is correct?
- A. A pH change reduces the kinetic energy of the enzyme
- B. A pH change adds extra active sites
- C. A pH change increases substrate concentration
- D. A pH change affects the bonds that hold the tertiary structure, changing the active site
5. Which describes how hormone responses compare with nervous responses?
- A. Faster and more localised
- B. Slower, longer-lasting and more widespread
- C. Faster and shorter-lived
- D. Slower and more localised