Assertion : In the descending limb of the loo | vedclass

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

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

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(A) The descending limb of the loop of Henle is permeable to water but impermeable to electrolytes like sodium. As the filtrate moves down,water is reabsorbed into the interstitium,which increases the concentration of solutes,making the filtrate hypertonic.The ascending limb of the loop of Henle is impermeable to water but permeable to electrolytes like sodium. As the filtrate moves up,electrolytes are actively or passively transported out of the tubule into the interstitium,which decreases the concentration of solutes,making the filtrate hypotonic.Therefore,both the Assertion and the Reason are correct,and the Reason explains why the tonicity changes in the respective limbs.

Assertion : In the descending limb of the loop of Henle,the urine is hypertonic,whereas in the ascending limb of the loop of Henle,the urine is hypotonic.
Reason : The descending limb is impermeable to sodium,while the ascending limb is impermeable to water.

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Assertion : In the descending limb of the loop of Henle,the urine is hypertonic,whereas in the ascending limb of the loop of Henle,the urine is hypotonic.Reason : The descending limb is impermeable to sodium,while the ascending limb is impermeable to water.