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 cells of the ascending limb of the loop of Henle to establish the medullary vertical osmotic gradient
B
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