Vasopressin

Multiple Choice

Vasopressin

A) can completely halt urine production during periods of water deprivation to conserve water for the body
B) activates the cyclic AMP second-messenger system within the tubular cells
C) renders the distal and collecting tubules impermeable to water
D) increases Na⁺ reabsorption by the distal portions of the nephron
E) stimulates the active salt pump of the ascending limb of the loop of Henle to establish the medullary vertical osmotic gradient