Which of the following statements is correct ?

1. The descending limb of loop of Henle is impermeable to water.

2. The ascending limb of loop of Henle is permeable to water.

3. The descending limb of loop of Henle is permeable to electrolytes.

4. The ascending limb of loop of Henle is impermeable to water.

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

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Answer: 4. The ascending limb of loop of Henle is impermeable to water.

Key idea: The two limbs of the loop of Henle differ in permeability, which builds the medullary gradient.

Descending limb: permeable to water, almost impermeable to electrolytes. Water leaves, so the filtrate becomes concentrated.
Ascending limb: impermeable to water but actively/passively lets electrolytes out, so the filtrate becomes dilute.

Statements (1), (2) and (3) reverse these facts. Answer: (4).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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