Human urine is usually acidic because

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(C) Human urine is typically acidic (pH approximately $6.0$) because the renal tubules,particularly the proximal convoluted tubule $(PCT)$ and the dis

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hydrogen ions are actively secreted into the filtrate.

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(C) Human urine is typically acidic (pH approximately $6.0$) because the renal tubules,particularly the proximal convoluted tubule $(PCT)$ and the distal convoluted tubule $(DCT)$,actively secrete hydrogen ions $(H^+)$ into the tubular filtrate. This process helps in maintaining the acid-base balance of the body fluids. By secreting $H^+$ ions,the kidneys help regulate the blood pH,and as a result,the urine becomes acidic.

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