2.67b) Human organs of Excretion

Recall that the lungs, kidneys and skins are organ of excretion

1. Lung x 2- release metabolic waste CO2 (carbon dioxide)

2. Kidney x 2 - excretion of excess water 

- molecule urea (nitrogen waste from amino acid as we can't store it so we excrete them) 

- salts

3. Skin - water & salts --> sweat

- little bit of urea