GI Tract & Intestines

The intestines are part of the gastrointestinal (GI) tract and include the small intestine and the large intestine. The small intestine is the organ where most digestion occurs.

The small intestine measures about 20 feet and includes the:

  • duodenum, the first part of the small intestine
  • jejunum, the middle section of the small intestine
  • ileum, the lower end of the small intestine

The large intestine absorbs water from stool and changes it from a liquid to a solid form, which passes out of the body during a bowel movement. The large intestine measures about 5 feet and includes the

  • cecum, the first part of the large intestine, which is connected to the ileum
  • colon, the part of the large intestine extending from the cecum to the rectum
  • rectum, the lower end of the large intestine leading to the anus