Question

Which of the following parts of the nephron is least permeable to water?

• A. Proximal tubule
• B. Collecting duct
• C. Descending limb of the loop. of Henle
• D. Ascending limb of the loop of Henle

Answer 1

Answer: (D)

Ascending limb of the loop of Henle

In the nephron the permeability of each part of the nephron is variable, the proximal tubule is impermeable, the collecting tubule being permeable to water whereas the descending limb is permeable to water whereas the ascending limbs are permeable to ions

Hence the answer is 'Ascending limb is least permeable to water'.