An increase in the permeability of collecting tubule cells to water is due to
A) a decrease in the production of antidiuretic hormone.
B) an increase in the production of antidiuretic hormone.
C) a decrease in the concentration of solutes in the blood plasma.
D) the presence of a salty urine in the bladder.

Question

Quizplus · Accepted Answer

The increased permeability of collecting tubule cells to water is due to an increase in the production of antidiuretic hormone (ADH), which is released by the posterior pituitary gland in response to signals from osmoreceptors in the hypothalamus. ADH increases water reabsorption from the collecting ducts and back into the bloodstream, leading to a concentration of urine and retention of water in the body. A decrease in ADH production would result in decreased water reabsorption and more dilute urine, while a decrease in solutes in the blood plasma or presence of a salty urine in the bladder would not directly affect the permeability of collecting tubule cells to water.

An Increase in the Permeability of Collecting Tubule Cells to Water