22) Most water is reabsorbed in the proximal convoluted tubule by obligatory rea

Question

22) Most water is reabsorbed in the proximal convoluted tubule by obligatory reabsorption, which means that: A) water is moving up its own gradient. B) water is "following sodium and other ions/molecules to maintain osmotic balance. C) the carrier that transports sodium cannot do so without binding water first. D) the proximal convoluted tubule cannot physically hold the volume of water that enters from the glomerular capsul E) the rate of water reabsorption never changes, regardless of water e, so water is reabsorbed because of hydrostatic pressure. intak

Explanation / Answer

Option B is correct.

Passive reabsorption of water( 65 to 75) takes place in PCT.,which is the site of reabsorption of sodium ,glucose ,bicarbonate etc.

Passive reabsorption of water in PCT,is secondary to active reabsorption of sodium and is called obligatory reabsorption of water.

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