Vasopressin Has Which of the Following Actions

Question

Vasopressin has which of the following actions?
A)It increases the water permeability of the thick ascending limb of Henle's loop.
B)It increases the urea permeability in the cortical portion of the collecting duct.
C)It increases the water permeability in the collecting duct.
D)It decreases the GFR.
E)It increases the water permeability in the proximal tubule.

Accepted Answer

Vasopressin, also known as antidiuretic hormone (ADH), increases the water permeability in the collecting duct. This allows for reabsorption of water and concentration of urine. The other options are incorrect: A - vasopressin does not affect water permeability in the thick ascending limb; B - vasopressin does increase urea permeability in the inner medullary collecting duct, but not in the cortical portion of the collecting duct; D - vasopressin does not have a direct effect on GFR; E - vasopressin does not increase water permeability in the proximal tubule.