Role of other organs in Excretion

ORGANS IN EXCRETION

Lungs:

The lungs help in removing CO₂ and water. Lungs eliminate around 18 L of CO₂ per hour and about 400 ml of water per day in normal resting condition.

Water loss will increase in cold dry climatic condition and will decrease in hot, humid climate. Different volatile material are also readily eliminated through lungs.

Skin:

Skin contains large number of sweat glands richly supplied with blood capillaries, from which they excrete sweat and some metabolic wastes.

Since the skin sends out plenty of water and small amount of salts, hence it serves as an excretory organ.

Sebaceous glands in skin eliminate sebum which contains waxes, sterols, some hydrocarbons & fatty acids.

Liver:

It produces bile pigments which are metabolic wastes of haemoglobin of dead R.B.C's.

Liver is also the main site for elimination of cholesterol, inactivated products of steroid hormones, some vitamins and many drugs.

Large Intestine:

Epithelial cells of large intestine excrete Ca²⁺, Mg²⁺, Fe²⁺ into the lumen of intestine and comes out along with faecal matter.