Question

Vasopressin, or Antidiuretic hormone (ADH), directly increases the permeability of which region of the nephron to water?

A. The glomerulus.
B. The collecting duct.
C. The proximal tubule.
D. The loop of Henle.

Answer 1

ADH directly increases the permeability of the collecting duct in the nephron to water.

Step-by-step explanation:

The antidiuretic hormone (ADH), also known as vasopressin, directly increases the permeability of the collecting duct in the nephron to water. ADH causes the movement of water channel proteins called aquaporins from the interior of the collecting tubule cells to the apical surface, where these proteins are inserted into the cell membrane. This results in an increased water permeability of the collecting duct cells, allowing for more reabsorption of water into the bloodstream.