Human excretory organs

The organs of excretion in humans include the skin, lungs and kidneys.

Skin

Sweat glands in the skin produce sweat. The water in sweat helps to keep the body cool in hot conditions, and it contains salts and urea.

Cross section of human skin showing the stratum corneum layer of the epidermis
Cross section of human skin

Lungs

Excess carbon dioxide and some water vapour are removed through the lungs when humans breathe out.

Kidneys

The kidneys are organs of the urinary system - which removes excess water, salts and urea.