NEET Biology question

Human urine is usually acidic because

(A)Potassium and sodium exchange generates acidity
(B)Hydrogen ions are actively secreted into the filtrateCorrect
(C)The sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries
(D)Excreted plasma proteins are acidic

Answer: (B)

Solution

Tubular cells of the PCT and DCT actively secrete hydrogen ions into the filtrate as part of maintaining the body's acid-base balance, and this secretion is what makes the resulting urine

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Question ID VK-116706