Human urine is usually acidic because:

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Question

(A) The kidneys play a vital role in maintaining the $pH$ of the blood. During the formation of urine,the tubular cells secrete $H^+$ ions,$K^+$ ions,

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Hydrogen ions are actively secreted into the filtrate.

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(A) The kidneys play a vital role in maintaining the $pH$ of the blood. During the formation of urine,the tubular cells secrete $H^+$ ions,$K^+$ ions,and ammonia into the filtrate. Specifically,the active secretion of $H^+$ ions into the renal filtrate helps in maintaining the ionic and acid-base balance of body fluids. Because of this active secretion of hydrogen ions,human urine typically exhibits an acidic $pH$.

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