The sole mechanism for water reabsorption by the renal tubules is

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Quizplus · Accepted Answer

Water reabsorption by the renal tubules occurs primarily via osmosis. This is due to the creation of an osmotic gradient by the active transport of solutes (such as sodium and chloride ions) out of the tubules and into the interstitial fluid, which draws water out of the tubules and into the surrounding capillaries. Cotransport with sodium and bicarbonate ions also occurs in the renal tubules, but these mechanisms do not account for water reabsorption alone.

The Sole Mechanism for Water Reabsorption by the Renal Tubules