Water reabsorption
A) occurs passively by osmosis in the proximal tubule.
B) is under the control of vasopressin in the distal and collecting tubules.
C) occurs by active transport in the distal and collecting tubules.
D) both (a) and (b) above.
E) all of these answers.

Question

Quizplus · Accepted Answer

Water reabsorption occurs mostly passively by osmosis in the proximal tubule, but it is also under the control of vasopressin in the distal and collecting tubules. Therefore, both options (a) and (b) are correct. Active transport occurs mainly in the ascending limb of the loop of Henle to reabsorb salts, not water. Therefore, option (c) is incorrect, and the best answer is (D), which includes the correct choices of (a) and (b).

Water Reabsorption