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Study the following statements.
a) Substances like glucose, amino acids, Na⁺, etc., in the filtrate are reabsorbed actively at PCT.
b) PCT helps to maintain the pH and ionic balance of the body fluids by selective secretion of hydrogen ions and ammonia into the filtrate and by absorption of HCO₃^- from it.
c) The descending limb of loop of Henle is permeable to electrolytes but almost impermeable to water.
d) Conditional reabsorption of Na⁺ and water takes at PCT.
Which of the above are correct?

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a and c

a and b

b and c

a and d

answer is B.

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Detailed Solution

The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes.

Conditional reabsorption of Na⁺ and water takes at DCT.

NCERT – Class XI – 294, 295

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