There are several systems and organs that contribute to waste removal: The kidneys (excrete water, nitrogen wastes from protein breakdown, some bacterial toxins, hydrogen ion, some salts, some heat), the lungs (carbon dioxide, heat, and a little water vapor), the skin (heat, water, some carbon dioxide, some salts and urea), and the GI tract (solid, undigested wastes, carbon dioxide, water, salts, and heat).
(several systems and organs; contribute; to waste removal; some bacterial toxins, hydrogen ion, some salts, some heat)
several systems and organs
contribute
to waste removal some bacterial toxins, hydrogen ion, some salts, some heat