[Campbell Biology P.1047] How does antidiuretic hormone ADH primarily increase water reabsorp... | Practice Question

How does antidiuretic hormone ADH primarily increase water reabsorption in the mammalian kidney?

  • A: By increasing active transport of salt in the loop of Henle.
  • B: By constricting afferent arterioles, increasing glomerular filtration rate.
  • C: By increasing the number of aquaporin channels in the collecting ducts.
  • D: By stimulating the release of aldosterone.

Explanation

Antidiuretic hormone ADH works by increasing the permeability of the collecting ducts to water. It achieves this by causing the insertion of aquaporin channels into the apical membrane of the collecting duct cells, allowing more water to be reabsorbed from the filtrate back into the blood.