Reabsorption of water in the collecting ducts requires which hormone?
a. Antidiuretic hormone (ADH)
b. Atrial natriuretic factor (ANP)
c. Renin
d. Aldosterone
ANS: A
ADH increases water permeability and reabsorption in the last segment of the distal tubule and along the entire length of the collecting ducts. ANP inhibits secretion of renin, inhibits angioten-sin-induced secretion of aldosterone, relaxes vascular smooth muscle, and inhibits sodium and water absorption by kidney tubules. Renin is secreted to raise blood pressure. Aldosterone regu-lates water and sodium balance.
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