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Excretion as an example of homeostatic control

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Question 7

The peptide hormone atrial natriuretic peptide (ANP) is released by cardiac muscle cells in the atria of the heart in response to high blood volume. ANP acts to reduce blood pressure.

The following statements describe processes related to the action of ANP:

  1. ANP inhibits the active reabsorption of Na+\text{Na}^+Na+ ions in the collecting ducts of the kidney, leaving more sodium in the filtrate.
  2. Water is retained in the kidney tubule lumen by osmosis, increasing urine volume and decreasing blood volume.
  3. ANP stimulates the secretion of aldosterone from the adrenal cortex.

Which of the above statements explain(s) how ANP is able to reduce blood pressure?

A

1, 2 and 3

B

only 1 and 2

C

only 2 and 3

D

only 1

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Excretion as an example of homeostatic control Questions

  1. A Level
  2. /Biology
  3. /Excretion as an example of homeostatic control

17 exam-style questions on OCR A A Level Biology Excretion as an example of homeostatic control. Each one has a worked solution and a mark scheme showing where the marks go.

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