Which one of the following enables the mammalian kidney to regulate water reabsorption during states of dehydration?

Options

A. The cells of the tubules detect the osmotic pressure of the blood.
B. Water is extracted from the glomerular filtrate in the proximal tubules.
C. The kidney produces a hypotonic urine.
D. Hormones increase the permeability of the collecting ducts.

Answer

D