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Question

A large quantity of fluid is filtered every day by the nephrons in the kidneys, but only about 1% of it is excreted as urine. The remaining 99% of the filtrate

A
Gets collected in the kidney.
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B
Is lost as sweat.
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C
Is stored in the urinary bladder.
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D
Is reabsorbed into the blood.
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Solution

The correct option is D Is reabsorbed into the blood.
About 80% of the water is reabsorbed by the proximal convoluted tubule. The rest is reabsorbed in the loop of Henle and collecting ducts by the influence of antidiuretic hormone. ADH increases the permeability of the walls of collecting duct. Thus only about 1% water is filtered as urine.
So, the correct answer is option D.

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