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Fats

Fat molecules are a rich source of energy for the body. The first step in digestion of a fat such as butter is to dissolve it into the watery content of the intestinal cavity. The bile acids produced by the liver act as natural detergents to dissolve fat in water and allow the enzymes to break the large fat molecules into smaller molecules, some of which are fatty acids and cholesterol.

The bile acids combine with the fatty acids and cholesterol and help these molecules to move into the cells of the mucosa. In these cells the small molecules are formed back into large molecules, most of which pass into vessels (called lymphatics) near the intestine. These small vessels carry the reformed fat to the veins of the chest, and the blood carries the fat to storage depots in different parts of the body.

The digestive system with the esophagus, stomach, liver, gallbladder, pancreas, large intestine, * small intestine, appendix, rectum, and anus.

Definitions For This Page - In Alphabetical Order

* Small Intestine
The small intestine is the organ where most digestion occurs. It measures about 22 feet and includes the duodenum, jejunum, and ileum. More about Small Intestine.

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References:
National Digestive Diseases Information Clearinghouse (NDDIC)
April 2008
digestive.niddk.nih.gov

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