text{NaCl} from the ascending limb of Henle's | vedclass

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(B) The concentration of urine is maintained by the counter-current mechanism involving the loop of Henle and the vasa recta.$	ext{NaCl}$ is transpor

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descending limb of vasa recta

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(B) The concentration of urine is maintained by the counter-current mechanism involving the loop of Henle and the vasa recta.$	ext{NaCl}$ is transported out of the ascending limb of the loop of Henle into the interstitial fluid.This $	ext{NaCl}$ is then picked up by the descending limb of the vasa recta.Conversely,urea is picked up by the ascending limb of the vasa recta.This exchange helps in maintaining the concentration gradient in the medullary interstitium,which is essential for the concentration of urine.

$\text{NaCl}$ from the ascending limb of Henle's loop is exchanged with:

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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 $H_2O$.

The vasa recta are tubular capillaries around the ........

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