MEDICAL
URINARY BLADDER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The mechanism of water reabsorption by the renal tubules is ____
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active transport
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osmosis
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filtration
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cotransport with sodium ions
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Explanation:
Detailed explanation-1: -Water reabsorption is by osmosis through water channels in the membrane. These water channels consist of a family of proteins called aquaporin . At least seven different aquaporin isoforms are expressed in the kidney.
Detailed explanation-2: -Water reabsorption is a passive process: water is reabsorbed by osmosis. In most of the nephron there is unregulated isosmotic reabsorption of water and solute, in other words, water reabsorption is coupled to solute reabsorption.
Detailed explanation-3: -Answer and Explanation: In the kidneys, water moves by osmosis from tubules called nephrons to the bloodstream. The nephrons are therefore hypotonic relative to the blood.
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