Read the following statements.
Statement I: The flow of filtrate in the two limbs of Henle’s loop is a counter current flow.
Statement II: The flow of blood through the two limbs of vasa recta is a concurrent flow.
In the light of above statements, choose the correct answer from the following options.

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Both statement I and statement II are incorrect

Statement I is correct but statement II is incorrect

Statement I is incorrect but statement II is correct

Both statement I and statement II are correct

answer is C.

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Detailed Solution

Mammals have the ability to produce a concentrated urine. The Henle’s loop and vasa recta play a significant role in this. The flow of filtrate in the two limbs of Henle’s loop is in opposite directions and thus forms a counter current. The flow of blood through the two limbs of vasa recta is also in a counter current pattern.

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^–1in the cortex to about 1200 mOsmolL^–1 in the inner medulla.

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