The digestive system runs from the mouth to the anus. It is made up of the stomach, the pharynx, the esophagus, the duodenum, the jejunum, and the ileum in the small intestine, and the cecum, ileum, and large intestine. The mouth, or oral cavity, has teeth for crushing food and a tongue for mixing food and saliva. a bag with a closed end that connects to the ileum, sigmoid colon, transverse colon, ascending colon, and descending colon. It ends in the rectum. The salivary glands, the gastric glands in the stomach lining, the pancreas, the liver, and the liver's supporting organs—the gallbladder and bile ducts—all contribute digestive fluids. The physical and chemical breakdown of ingested food and the eventual evacuation of nondigestible wastes are both facilitated by each of these organs and glands. In this section, their structures and roles are step-by-step explained.
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