Question

Assertion : The final reabsorption of water from into blood occurs through the collecting duct of a mammalian nephron, resulting in the production of hyperosmotic .

Reason : The loop of Henle is responsible for formation of a sodium gradient across the depth of the cortical interstitium of a mammalian kidney.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is (b) Both A and R are true but R is not correct explanation of A.

Explanation:

The effect of collecting duct depends on the presence of vasopressin over there. This hormone increases the permeability of the collecting duct to water. Gradually the rate of reabsorption from the filtrate increases and it becomes hyperosmotic.

Loop of Henle is a U-shaped tubular part which **** in the renal medulla. It has a thin walled permeable descending limb and thick walled impermeable ascending limb. Na+, K+ and Cl- are transported out of the thick segment of ascending limb.