Flexi Says: The large intestine eliminates solid wastes that remain after the digestion of food in the gastrointestinal tract. The liver breaks down excess amino acids in the blood to form ammonia and then converts the ammonia to urea, a less toxic substance. The liver also breaks down other toxic substances in the blood, including alcohol and drugs.
The skin eliminates water and salts in sweat. The lungs exhale water vapor and carbon dioxide. Urine is a liquid waste formed by the kidneys as they filter the blood.
