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Anatomy of the Digestive System

Food gives the body the energy needed for life. The digestive system breaks food down into basic nutrients that can be used by the body. The digestive tract is a long, muscular tube that extends from the mouth through the stomach and intestines to the anus. As food moves along the digestive tract, it's digested. This means it's changed into substances that can be absorbed into the bloodstream. Certain organs (such as the liver, gallbladder, and pancreas) help with this digestion. Parts of food that can't be digested are turned into stool. This is waste material that's passed out of the body.

Digestive system

Outline of man showing gastrointestinal system.

The digestive system is made up of the following:

  • The mouth. Takes in food, breaks it into pieces, and begins the digestion process.

  • The esophagus. Moves food from the mouth to the stomach.

  • Thestomach. Breaks food down into a liquid mixture.

  • Theliver. Makes bile that helps digest fat.

  • The gallbladder. Stores bile.

  • Thepancreas. Makes enzymes that help in digestion.

  • Thesmall intestine. Digests food further and absorbs nutrients. What's left is passed on to the colon as liquid waste.

  • The large intestine (colon). Absorbs water, salt, and minerals from the waste, forming a solid stool.

  • The rectum. Stores stool until a bowel movement happens.

  • Theanus. The opening where stool leaves the body.

Online Medical Reviewer: Jen Lehrer MD
Online Medical Reviewer: Raymond Kent Turley BSN MSN RN
Online Medical Reviewer: Rita Sather RN
Date Last Reviewed: 10/1/2021
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