We can produce concentrated/dilute urine. This is facilitated by a special mechanism. Identify the mechanism.
(a) Reabsorption from PCT
(b) Reabsorption from collecting duct
(c) Reabsorption/secretion in DCT
(d) Counter current mechanism in Henle's loop/Vasa recta

Answers (1)

The answer is the option (d) Counter current mechanism in Henle's loop/Vasa recta
Explanation:
The two limbs of Henle's loop, as well as vasa recta, witness counter currents when we move towards the descending limb the concentration increases whereas it is diluted as we move towards the ascending limb.

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