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Assertion: Increasing osmolarity towards the inner
Page No. 294
medullary interstitium are maintained from 300
\( \mathrm{P} \)
\( \mathrm{mOsmol} / \mathrm{L} \) in the cortex to about \( 1200 \mathrm{mOsmol} / \mathrm{L} \) in
W
the inner medulla.

Reason: There is proximity between the Henle's loop and Vasa recta, as well counter current in them.
(1) Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).
(2) Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).
(3) Assertion (A) is true and Reason (R) is false.
(4) Assertion (A) and Reason (R) both are false.
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