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Home  >>  JEEMAIN and AIPMT  >>  Biology  >>  Human Physiology
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Small amounts of urea enter the ___________ (K) of ___________ (J) which is transported back to the interstitium by the _________________ (L). The above described transport of substances facilitated by the special arrangement of Henle’s loop and vasa recta is called the counter current mechanism that helps to maintain a concentration gradient in the _________________ (C). Presence of such interstitial gradient helps in an easy passage of water from the _______________ (L).

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( a ) thin segment of the descending limb of Henle’s loop, collecting tubule; outer medullary interstitium; collecting tubule
( b ) thin segment of the ascending limb of Henle’s loop, collecting tubule; inner medullary interstitium; collecting tubule
( c ) thin segment of the ascending limb of Henle’s loop, collecting tubule; inner medullary interstitium; vasa recta
( d ) thick segment of the descending limb of Henle’s loop, collecting tubule; outer medullary interstitium; vasa recta
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(B) is the right answer.

NaCl is transported by the ascending limb of Henle’s loop which is exchanged with the descending limb of vasa recta. NaCl is returned to the interstitium by the ascending portion of vasa recta. Similarly, small amounts of urea enter the thin segment of the ascending limb of Henle’s loop which is transported back to the interstitium by the collecting tubule. The above described transport of substances facilitated by the special arrangement of Henle’s loop and vasa recta is called the counter current mechanism. This mechanism helps to maintain a concentration gradient in the medullary interstitium. Presence of such interstitial gradient helps in an easy passage of water from the collecting tubule thereby concentrating the filtrate (urine). Human kidneys can produce urine nearly four times concentrated than the initial filtrate formed.
answered Mar 26, 2014 by pady_1
 

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