Answer:
D) causing an increase in the number of aquaporin molecules of collecting duct cells
Explanation:
Action. ADH acts in the kidney to regulate the volume and osmolarity of the urine. Specifically, it acts in the distal convoluted tubule (DCT) and collecting ducts (CT) cells.
This increases the water reabsorbed from the urine, in order to decrease plasma osmolality and increase total blood volume.
The principal action of ADH is to regulate the amount of water excreted by the kidneys. ... ADH travels in the bloodstream to the kidneys. Once at the kidneys, ADH changes the kidneys to become more permeable to water by temporarily inserting water channels, aquaporins, into the kidney tubules.
Antidiuretic hormone stimulates water reabsorbtion by stimulating insertion of "water channels" or aquaporins into the membranes of kidney tubules. These channels transport solute-free water through tubular cells and back into blood, leading to a decrease in plasma osmolarity and an increase osmolarity of urine.
