NEET 2010 Biology question

Which one of the following statements in regard to the excretion by the human kidneys is correct

(1)Distal convoluted tubule is incapable of reabsorbing
(2)Nearly 99 per cent of the glomerular filtrate is reabsorbed by the renal tubulesCorrect
(3)Ascending limb of loop of Henle is impermeable to electrolytes
(4)Descending limb of loop of Henle is impermeable to water

Answer: (2)

Solution

The kidneys form about 180 L of glomerular filtrate per day, but only about 1.5 L of urine is passed; thus nearly 99 per cent of the filtrate is reabsorbed by the renal tubules. So (2) is correct. (1) is wrong: the DCT conditionally reabsorbs Na+ and water and also reabsorbs bicarbonate

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Question ID VK-090568