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Home  >>  JEEMAIN and AIPMT  >>  Biology  >>  Human Physiology
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The proximity between the _______ and ________, as well as the ____________ in them help in maintaining an increasing osmolarity from 300 mOsmolL–1 in the ___________ (A) to about 1200 mOsmolL–1 in the _____________ (C). This gradient is mainly caused by _________ and ____________ .

image
( a ) Henle’s loop and vasa recta; counter current ; cortex, inner medulla; NaCl and urea
( b ) Henle’s loop and vasa recta; counter current ; outer medulla, inner medulla; NaCl and HCO3-
( c ) collecting duct and vasa recta; counter current ; cortex, inner medulla; NaCl and urea
( d ) collecting duct and vasa recta; counter current ; medulla, cortex; NaCl and HCO3-
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1 Answer

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(A) is the right answer.

The proximity between the Henle’s loop and vasa recta, as well as the counter current in them help in maintaining an increasing osmolarity towards the inner medullary interstitium, i.e., from 300 mOsmolL–1 in the cortex to about 1200 mOsmolL–1 in the inner medulla. This gradient is mainly caused by NaCl and urea.
answered Mar 26, 2014 by pady_1
 

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