Reabsorption of solutes in the proximal tubule creates an osmotic gradient that promotes the reabsorption of water via osmosis.

Question

Quizplus · Accepted Answer

When solutes are reabsorbed in the proximal tubule, the resulting increase in solute concentration in the interstitial fluid creates an osmotic gradient that drives the reabsorption of water from the tubule into the surrounding capillaries via osmosis. This process is known as obligatory water reabsorption and accounts for most of the water reabsorbed in the kidney.

Reabsorption of Solutes in the Proximal Tubule Creates an Osmotic