Q.

Human urine is usually acidic because

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a

hydrogen ions are actively secreted into the filtrate

b

potassium and sodium exchange generates acidity

c

the sodium transporter exchanges one hydrogen ions for each sodium ion, in peritubular capillaries

d

excreted plasma proteins are acidic

answer is B.

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Detailed Solution

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Selective secretion of hydrogen ions makes the urine slightly acidic (pH-6.0).

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