Question

Why is excretion necessary? Name the common excretory substances in our body.

Answer 1

The process of removal of chemical wastes from the body is known as excretion. Excretion plays an important role in maintaining the homeostatic condition of the body.

There are a number of chemicals substances which are regularly formed in our body or which are absorbed through the food that must be eliminated – otherwise, they become harmful. Some such substances are,

(1) Carbon dioxide and water

(2) Nitrogenous metabolic waste

(3) Excess salts and vitamins

(4) Water

(5) Bile pigments.