Which digestive organ is responsible for waste elimination?

• A. Stomach
• B. Small intestine
• C. Liver
• D. Large intestine

Answer: (D)

Waste elimination in digestion is handled by the large intestine. After nutrients have been absorbed in the small intestine, indigestible matter moves into the colon where water and electrolytes are reabsorbed and the material is formed into solid waste (feces). This waste is stored until defecation through the rectum and anus. The other organs have different primary roles: the stomach mixes and begins digestion, the small intestine does most nutrient absorption, and the liver processes metabolites and bile but does not form feces.