Title: Human Intestines | Interactive Anatomy Guide
Headings: Intestines
Intestines
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Content: It extends from the stomach to the large intestine and consists of 3 major regions: the duodenum, jejunum, and ileum. The duodenum receives partially digested food from the stomach, bile from the liver and gallbladder, and pancreatic juice from the pancreas. These substances mix in the duodenum to further digest food into its most basic units. The duodenum begins to absorb nutrients from the food passing through its lumen. Food next passes into the jejunum, a longer region of intestine where the bulk of the absorption of nutrients takes place. Finally, food passes into the ileum, the longest region of the small intestine. Any last nutrients that were not absorbed in the jejunum are absorbed in the ileum before the food passes into the large intestine. The large intestine is about 2.5 inches in diameter and about 5 feet long in a living body. It receives fecal matter from the small intestine through the ileocecal sphincter.