Which organ forms waste and toxins into stool?

• A. Large intestine
• B. Liver
• C. Spleen
• D. Pancreas

Answer: (A)

The large intestine is where waste becomes stool. After most nutrients are absorbed in the small intestine, the remaining indigestible material passes into the colon, where the body reabsorbs water and electrolytes. This process concentrates the material into a solid form—feces—that is stored in the rectum and then eliminated as stool. Bacteria in the colon also help break down some substances and contribute to the stool’s composition. The liver detoxifies substances and produces bile, but does not form stool; the spleen supports immune function and blood filtration; the pancreas releases digestive enzymes into the small intestine. So, forming waste into stool is a function of the large intestine.