2.67b Human organs of Excretion

recall that the lungs, kidneys and skin are organs of excretion

1. Lungs
- Carbon dioxide (waste from respiration)

2. Kidneys
- Excess H2O
- Urea (nitrogen waste from amino acids, because of inability to store amino acids)
- Salts

3. Skin
- Sweat (H2O and salts)
- to a lesser extent, urea