2023 Manipur Excretory Products and their EliminationLoop of Henle - counter current mechanism Medium Question 11 of 60 in Excretory Products and their Elimination

Ascending limb of loop of Henle is impermeable to water and allows transport of electrolytes actively or passively.

Reason: Dilution of filtrate takes place due to efflux of electrolytes in the medullary fluid.
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 the correct explanation of A
C A is true but R is false
D A is false but R is true

The answer is A.

Solution

The ascending limb of the loop of Henle is indeed impermeable to water and actively/passively transports electrolytes out into the medullary interstitium. This efflux of electrolytes from the ascending limb (without accompanying water) causes dilution of the filtrate as it moves up — the Reason correctly explains why dilution of the filtrate occurs.

Concept Loop of Henle - counter current mechanism

Excretory Products and their Elimination in past papers

60 questions from this chapter have appeared across 24 exam years.