15. Antidiuretic hormone (ADH) functions at the cellular level by

A. decreasing the speed at which filtrate flows through the nephron, leading to increased reabsorption of water.

B. stimulating the reabsorption of glucose through channel proteins

C. causing membranes to include more phospholipids that have unsaturated fatty acids

D. causing an increase in the number of aquaporin molecules of collecting duct cells

E. triggering the synthesis of an enzyme that makes the phospholipids bilayer more permeable to water

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.

Larus Larus · Answer 2 · 2025-03-27T14:39:00-04:00

At the cellular level ADH results in the increase in the number of aquaporin molecules of collecting duct cells.

What is the function of ADH?

In the kidney, ADH works to monitor the osmolarity and volume of the urine. Mainly it works in the collecting ducts cells and distal convoluted tubule. This enhances the reabsorption of water from the urine, to increase the total volume of the blood and to reduce plasma osmolarity.

The prime role of ADH is to monitor the concentration of water excreted by the kidneys. In the bloodstream, ADH travels to the kidneys. ADH makes the kidneys more permeable to water by inserting the water channels called aquaporins into the kidney tubules temporarily.

ADH instigates reabsorption of water by instigating aquaporins insertion into the kidney tubules membranes. These work as channels and transport water, which is free of solutes via the tubular cells and back into the blood, resulting in the increase in the osmolarity of urine and decrease in the osmolarity of plasma.

Thus, the correct answer is option D.

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