A : In the descending limb of the loop of Hen | vedclass

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(A) The descending limb of the loop of Henle is permeable to water but nearly impermeable to electrolytes. As the filtrate moves down,water is lost to

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) The descending limb of the loop of Henle is permeable to water but nearly impermeable to electrolytes. As the filtrate moves down,water is lost to the hypertonic medullary interstitium,making the filtrate hypertonic.The ascending limb of the loop of Henle is impermeable to water but allows the transport of electrolytes ($Na^+$,$Cl^-$) actively or passively. As the filtrate moves up,electrolytes are removed,making the filtrate hypotonic.Therefore,both the Assertion and the Reason are correct,and the Reason correctly explains why the tonicity changes in the respective limbs.

$A :$ In the descending limb of the loop of Henle,the urine is hypertonic,while in the ascending limb of the loop of Henle,the urine is hypotonic.
$R :$ The descending limb is impermeable to $Na^+$,while the ascending limb is impermeable to $H_2O$.

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$A :$ In the descending limb of the loop of Henle,the urine is hypertonic,while in the ascending limb of the loop of Henle,the urine is hypotonic.$R :$ The descending limb is impermeable to $Na^+$,while the ascending limb is impermeable to $H_2O$.