Question

ADH increases the permeability of the collecting duct to water, and so water flows:

A. from the nephron into the blood, to increase the volume if the fluid in the nephron.
B. from the blood into the nephron, to increase the volume if the fluid in the nephron.
C. from the nephron into the blood, to decrease the volume if the fluid in the nephron.
D. from the blood into the nephron, to decrease the volume if the fluid in the nephron.

Answer 1

ADH increases the permeability of the collecting duct to water, causing water to flow from the nephron into the blood.

Step-by-step explanation:

ADH, or antidiuretic hormone, increases the permeability of the collecting duct to water. This means that water flows from the nephron into the blood. When ADH is present, the collecting ducts reabsorb more water, allowing it to be returned to the bloodstream. As a result, the volume of fluid in the nephron decreases, leading to a concentrated urine.