The digestive system is made up
of the digestive tract—a series of hollow organs joined in a long, twisting tube
from the mouth to the anus—and other organs that help the body break down and
absorb food (see figure).
Organs that make up the
digestive tract are the mouth, esophagus, stomach, small intestine, large
intestine—also called the colon—rectum, and anus. Inside these hollow organs is
a lining called the mucosa. In the mouth, stomach, and small intestine, the
mucosa contains tiny glands that produce juices to help digest food. The
digestive tract also contains a layer of smooth muscle that helps break down
food and move it along the tract.
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