How are urea and drugs removed from the blood? How is the pH in the blood adjusted?
1) Through the kidneys and excreted in urine; by releasing or absorbing H⁺ ions into or out of the blood
2) Through the liver and excreted in bile; by releasing or absorbing H⁺ ions into or out of the blood
3) Through the lungs and excreted in exhaled air; by releasing or absorbing H⁺ ions into or out of the blood
4) Through the skin and excreted in sweat; by releasing or absorbing H⁺ ions into or out of the blood
