Esophagus: Your esophagus' main job is to transport food and drink from your mouth to your stomach. Food and fluids flow from your lips to your throat first when you swallow (pharynx). The epiglottis is a tiny muscle flap that shuts to keep food and drink from flowing down the "wrong pipe" – your windpipe (trachea). The uvula, a little flap that helps prevent liquid from traveling upward into your nasal cavity, is another small flap.

Large Intestine: The large intestine is the final segment of your gastrointestinal (GI) tract, which is a lengthy, tube-like channel via which food passes through your digestive system. It runs from the small intestine to the anal canal, where food waste is expelled from the body.

Stomach: In most vertebrates, the stomach is a saclike enlargement of the digestive system placed between the esophagus and the small intestine in the anterior section of the abdominal cavity. Before food is transferred into the intestine, the stomach functions as a temporary container for storage and mechanical distribution. Some of the chemical processes of digestion take place in the stomachs of animals with digestive glands.