Question

the mechanism of excretion in the kidney of man

Answer 1

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The kidneys remove from the blood the nitrogenous wastes such as urea, as well as salts and excess water, and excrete them in the form of urine. ... The urine from the kidney is collected by the ureter (or excretory tubes), one from each kidney, and is passed to the urinary bladder.

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Answer 2

Their primary function is the elimination of excess water and wastes from the bloodstream by the production of urine. The kidneys contain tiny structures called nephrons that filter materials out of the blood, return to the blood what is needed, and excrete the rest as urine.