The ascending portion of the loop of Henle is
A)permeable to water and impermeable to sodium.
B)permeable to water and permeable to sodium.
C)impermeable to water and permeable to sodium.
D)impermeable to water and impermeable to sodium.
E)the site of active transport of water.

Question

Quizplus · Accepted Answer

The ascending portion of the loop of Henle is impermeable to water and permeable to sodium. This is where sodium ions are actively transported out of the tubule and into the surrounding tissue, creating a concentration gradient that allows for the reabsorption of water in the descending limb. As a result, the ascending limb is not involved in water reabsorption, but rather helps to create a hypertonic environment in the renal medulla.

The Ascending Portion of the Loop of Henle Is