Question

Question 16 1.67 pts Time Atten 1 Ho How does the loop of Henle enable the mammalian kidney to produce hyperosmotic urine? 1-The ascending limb of the loop actively extrudes Nat. Il-The descending limb interacts with the ascending limb to raise the osmolarity of the extracellular fluid in the renal medulla. III- The concentration is further enhanced by the presence of urea, which draws water out of the collecting ducts by osmosis. 24/7 just III justi lland I and II 0 LII, and Ill

Answer 1

Answer:- The descending limb of the loop of henle is permeable to water . So as the filtrate passes through the descending limb of loop of henle , the concentration of the filtrate increases as water releases out of the the renal tubule into the medulla . The ascending limb of the loop of henle is permeable to solute and impermeable to solvent.

So as the filtrate passing through the ascending limb , the concentration of the filtrate will decrease . The ascending limb of loop of henle actively transport sodium ions and increases osmolarity of medullary fluid . The urea that is present in the filtrate go into the medullary interstitium to increase the osmolarity of the interstitium to around 1200mosmol litres-1. The structure of the loop of henle is well explained in the diagram.

e No Dute Interstitial osmolarity 360 [mosmuollky? 300 WHA Cho Nat, ci $00 leta प & 4o Ascending descending 5700 5500 Limb lea 9.00 HO 7oo Mo Todo 100 HO wrea

Hence , option 5 is the correct answer.

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