MEDICAL
URETERS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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180 L and 65%
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240 L and 85%
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80 L and 35%
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280 L and 99%
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Detailed explanation-1: -B: Approximately 180 L of filtrate enters the nephrons each day; of that volume, 65% is reabsorbed in the proximal tubule. In the proximal tubule, solute molecules move by active transport and cotransport from the lumen of the tubule into the interstitial fluid.
Detailed explanation-2: -Though the volume of blood kidney filters is 180 L a day then, why is the volume of urine only one to two litres ? Though the volume of blood filtered by the kidney is 180 L the volume of urine is just 1-2 litres because the remaining nutrients and water are reabsorbed in the kidney tubules.
Detailed explanation-3: -Over 70% the filtrate is reabsorbed here. In addition, many important solutes (glucose, amino acids, bicarbonate) are actively transported out of the proximal tubule such that their concentrations are normally extremely low in the remaining fluid.