Which of the following statements is correct?
Answer: (A) The ascending limb of loop of Henle is impermeable to water. Answer: (A) The ascending limb of loop of Henle is impermeable to water.
- A.The ascending limb of loop of Henle is impermeable to water✓
- B.The descending limb of loop of Henle is impermeable to water
- C.The ascending limb of loop of Henle is permeable to water
- D.The descending limb of loop of Henle is permeable to electrolytes
Correct Answer
(A) The ascending limb of loop of Henle is impermeable to water
Solution & Explanation
Answer: (A) The ascending limb of loop of Henle is impermeable to water. Solution: In the loop of Henle, the descending limb is permeable to water but almost impermeable to electrolytes, so the filtrate concentrates moving down. The ascending limb is the reverse — impermeable to water but allows transport of electrolytes, so the filtrate gets diluted moving up. This makes only option A correct. NCERT Reference: Ch 16, p.209, lines 38-41 — "The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes... The ascending limb is impermeable to water but allows transport of electrolytes actively or passively."