Which segment of the nephron is NOT permeable to H₂O a., even in the presence of vasopressin
A)proximal tubule
B)ascending limb of the loop of Henle
C)descending limb of the loop of Henle
D)distal tubule

Question

Quizplus · Accepted Answer

The ascending limb of the loop of Henle is impermeable to water, even in the presence of vasopressin. This is because the cells in the ascending limb actively transport sodium and chloride out of the filtrate, creating a hypertonic environment in the interstitial fluid surrounding the ascending limb, which draws water out of the descending limb. Therefore, water cannot passively diffuse out of the ascending limb, as it can in other segments of the nephron.

Which Segment of the Nephron Is NOT Permeable to H₂O