MEDICAL
KIDNEY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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50%
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70%
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80%
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90%
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Detailed explanation-1: -The proximal tubules reabsorb about 65% of water, sodium, potassium and chloride, 100% of glucose, 100% amino acids, and 85-90% of bicarbonate. This reabsorption occurs due to the presence of channels on the basolateral (facing the interstitium) and apical membranes (facing the tubular lumen).
Detailed explanation-2: -On average, 180L of water is filtered by the kidneys daily. However, only 1.5-2L actually ends up being excreted as urine. This means almost 99% of the water filtered is either reabsorbed into the circulation or enters the interstitium.
Detailed explanation-3: -Therefore, most of water in filtrate must be reabsorbed. Must reabsorb up to 99% + of filtrate. 85% of filtered water and NaCl is reabsorbed in proximal tubule.