how exrection in humans takes place
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Humans have two kidneys each kidney is supplied with blood from the renal artery. The kidney removes from the blood the nitrogeous wastes such as urea as wall as salts and execess water and excrete them in the form of urine..... the filtrated blood is carried away from the kidneys by the renal vein(kidney vein) .
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The blood is responsible to transport food, oxygen, and waste materials in human bodies. Blood usually consists of a fluid medium known as plasma where the cells remain suspended. Plasma is responsible to transport food, carbon dioxide, and nitrogenous wastes in dissolved form.
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