Which of the following stimulates aldosterone secretion? A) an increase in plasma K⁺. B) a decrease in plasma K⁺. C) activation of the renin-angiotensin pathway. D) both (a) and (c) above. E) both (b) and (c) above.

Question

Quizplus · Accepted Answer

An increase in plasma K+, Na+ or decrease in plasma volume leads to activation of the renin-angiotensin pathway, which in turn stimulates aldosterone secretion. So, option C is correct. Option A is also correct because aldosterone increases reabsorption of Na+ and excretion of K+ in the distal tubules of the kidney. In the presence of high plasma K+ concentration, aldosterone secretion is stimulated to increase K+ excretion from the body. Therefore, both (a) and (c) above are correct, making option D the best choice. Option E, on the other hand, is incorrect as a decrease in plasma K+ concentration does not stimulate aldosterone secretion.

Which of the Following Stimulates Aldosterone Secretion