A) It loses urea to the renal medulla, helping this tissue to maintain it?s cone. gradient of solutes.
B) It provides water for reabsorption by the interstitial fluid and Capillaries
C) It helps to maintain the concentration gradient of NaCl in the interrstitial fluid. Thus increasing the water reabsorption
D) It absorps some drugs and poisons from the surrounding capillaries.
Correct Answer: C
Solution :
Ascending limb is permeable to \[\,N{{a}^{+}}\] & Cl ions so these come out from leumen to interstitial fluid. In interstitial fluid high concentration of \[\,N{{a}^{+}}\] & Cl is maintained by counter-current mechanism, operating between the two arms. This help in maintaining high osmolarity in interstitial fluid. This increasing water reabsorption.
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