To maintain the required osmotic concentratio | vedclass

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(A) In ureotelic animals,such as mammals,the kidneys maintain a high osmolarity in the medullary interstitium to facilitate the concentration of urine

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(A) In ureotelic animals,such as mammals,the kidneys maintain a high osmolarity in the medullary interstitium to facilitate the concentration of urine.This process is primarily achieved through the counter-current mechanism involving the loop of $Henle$ and the $vasa$ $recta$.Specifically,some amount of urea is reabsorbed from the collecting duct into the medullary interstitium.This urea contributes significantly to the osmotic gradient,allowing for the reabsorption of water from the filtrate,thereby producing concentrated urine.

To maintain the required osmotic concentration in the medullary interstitium of the kidneys of ureotelic animals,some amount of ..... is retained.

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