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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
Detailed 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.