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Digestive System



  The digestive system is a long and winding tube, that starts at the mouth and ends at the anus, this is called the alimentary canal or gastrointestinal (GI) tract. Think of the tube as a passageway that extends through the body like a hallway through a building. Food must be broken down or digested and then absorbed through the walls of the digestive tube before it can actually enter the body and be used by the cells. The breakdown or digestion of food material is both mechanical and chemical in nature. The teeth are used to physically breakdown food material before it is swallowed. The churning of food in the stomach then continues the mechanical breakdown process. Chemical breakdown results from the action of digestive enzymes and other chemicals acting on food as it passes through thr GI tract.

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