Which statement is correct? A) Water reabsorption is under control of vasopressin throughout the length of the nephron. B) The ascending limb of the loop of Henle is always impermeable to water. C) Vasopressin makes the distal and collecting tubules impermeable to water. D) Fifteen percent of the filtered water osmotically follows the absorption of Na⁺ and other solutes in the proximal tubule. E) Water reabsorption is passive in the early portions of the nephron but is active in the distal portions of the nephron.

Question

Quizplus · Accepted Answer

The ascending limb of the loop of Henle is always impermeable to water, which is crucial for the countercurrent multiplication mechanism that concentrates urine.

Which Statement Is Correct