'Human Digestive System - Explained with 3D Animations Food is our fuel, and its nutrients give our bodies\' cells the energy and substances they need to work. But before food can do that, it must be digested into small pieces the body can absorb and use. The digestive system is made up of the alimentary canal (also called the digestive tract) and other organs, such as the liver and pancreas. The alimentary canal is the long tube of organs — including the esophagus, stomach, and intestines — that runs from the mouth to the anus. An adult\'s digestive tract is about 30 feet long.'
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