Which of the following pertains to the ascending limb of the loop of Henle
A)NaCl passively leaves the tubular fluid down its concentration gradient.
B)NaCl is actively transported into the interstitial fluid, leaving water behind because the tubular cells are not permeable to water.
C)K⁺ is secreted.
D)Aldosterone stimulates Na⁺ reabsorption.

Question

Quizplus · Accepted Answer

The ascending limb of the loop of Henle is impermeable to water, and actively transports NaCl into the interstitial fluid. This creates a concentration gradient that helps to drive water reabsorption in the descending loop. Choice A is incorrect because NaCl is actively transported, not passively leaving down its concentration gradient. Choice C pertains to the distal convoluted tubule, not the loop of Henle. Choice D pertains to the action of aldosterone, which acts on the distal convoluted tubule and collecting duct to stimulate sodium reabsorption.

Which of the Following Pertains to the Ascending Limb of the Loop