Human urine is usually acidic because

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(B) The human urine is usually acidic because the renal tubules,specifically the proximal convoluted tubule $(PCT)$ and the distal convoluted tubule $

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hydrogen ions are actively secreted into the filtrate

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(B) The human urine is usually acidic because the renal tubules,specifically the proximal convoluted tubule $(PCT)$ and the distal convoluted tubule $(DCT)$,actively secrete hydrogen ions $(H^+)$ into the filtrate.This process helps in maintaining the acid-base balance of the body fluids.Additionally,the reabsorption of bicarbonate ions $(HCO_3^-)$ from the filtrate back into the blood further contributes to the acidic nature of the urine.

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