Which segment of renal tubule is permeable to water but nearly impermeable to salts

Options

A. Proximal convoluted tubule
B. Descending limb of Henle's loop
C. Ascending limb of Henle's loop
D. Distal convoluted tubule

Answer

B

Explanation

(b) In descending limb of loop of Henle, water is reabsorbed due to increasing osmolality of interstitial fluid. Sodium and other solutes are not reabsorbed here. The filtrate brcome hypertonic to blood plasma. In ascending limb of loop of Henle, solutes (Na, K, Ca, Mg, Cl) are reabsorbed where as it is impermeable to water. ltbegtIn distal convoluted tuble, there is active reabsorption of sodium ions from the diltrate under the influence of aldosterone.