Question

Define excretion.
Write two vital functions of the kidneys.

Answer 1

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Toxic wastes, which are produced in the body during the functioning of cells are harmful to the body and hence are out thrown from body through the excretion. Function of Kidneys: Absorption of water and salt Removal of waste materials like urea, ammonia etc from blood Blood pressure control.

Answer 2

The biological process of removal of harmful metabolic wastes from body especially nitrogenous waste is called excretion.

Vital function of the kidney:

(i) To regulate the right amount of water in the body.

(ii) Help in filtering out nitrogenous waste like urea from the blood.