The mechanism for producing a concentrated urine involves
A)the secretion of antidiuretic hormone (ADH)by the neurohypophysis.
B)aquaporins being inserted into the membranes of the collecting duct cells.
C)a high concentration of NaCl in the interstitial fluid that surrounds the collecting ducts.
D)an increase in facultative water reabsorption.
E)All of the answers are correct.

Question

Quizplus · Accepted Answer

All of the given choices are correct and play a role in the mechanism for producing a concentrated urine. Antidiuretic hormone (ADH) is secreted by the neurohypophysis to increase the permeability of the collecting duct to water. Aquaporins are inserted into the membranes of collecting duct cells, allowing for water reabsorption. A high concentration of NaCl in the interstitial fluid surrounding the collecting duct creates a gradient for water reabsorption. Facultative water reabsorption occurs when the body needs to conserve water, and is controlled by ADH.

The Mechanism for Producing a Concentrated Urine Involves