The ascending limb of the loop of Henle is where 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. E) None of these.

Question

Quizplus · Accepted Answer

The ascending limb of the loop of Henle is impermeable to water, so NaCl is actively transported into the interstitial fluid, leaving water behind in the tubular fluid. Choice A refers to the descending limb, choice C is not relevant, and choice D refers to the distal convoluted tubule.

The Ascending Limb of the Loop of Henle Is Where