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Question

Counter current mechanism helps in concentrating urine in animals and mainly operates on:
a. Henle's loop b. Vasa-recta
c. PCT d. DCT

A
a only
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B
b only
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C
a and b
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D
All of these
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Solution

The correct option is C a and b
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 Henle’s loop and vasa-recta is in opposite directions and thus forms a counter current mechanism.

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