The organs of excretion in humans include the skin, lungs and kidneys.
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.
Excess carbon dioxide and some water vapour are removed through the lungs when humans breathe out.
The kidneys are organs of the urinary system - which removes excess water, salts and urea.