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In the renal tubules the permeability of the distal convoluted tubule and collecting duct to water is controlled by

1. Vasopressin
2. Aldosterone
3. Growth hormone (GH)
4. Renin

Correct answer: Vasopressin

Solution

Vasopressin (ADH) directly increases water permeability in the distal convoluted tubule and collecting duct by promoting aquaporin insertion. This allows more water to be reabsorbed back into the blood, concentrating the urine.

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