The mechanism for producing concentrated urine involves all of the following except A)the secretion of antidiuretic hormone (ADH). B)aquaporins being inserted into the membranes of the collecting duct cells. C)a high concentration of NaCl in the fluid surrounding the collecting ducts. D)a properly functioning nephron loop. E)the release of natriuretic peptides.

Question

Quizplus · Accepted Answer

The release of natriuretic peptides inhibits the reabsorption of Na+ and water in the kidneys, and thus is not involved in the mechanism for producing concentrated urine. The other choices (A, B, C, and D) are all important in the production of concentrated urine. ADH promotes water reabsorption by the collecting ducts, aquaporins allow water to move through the collecting duct cells, a high concentration of NaCl in the interstitial fluid facilitates water reabsorption by osmosis, and a properly functioning nephron loop establishes an osmotic gradient in the interstitial fluid.

The Mechanism for Producing Concentrated Urine Involves All of the Following