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The digestive system is one of the most complex systems of the body.  It provides the body's means of transforming food to energy.  Food first enters the digestive system through the mouth, travels through a series of complex, specialized organs, which churn, process, and transform it into fuel.  Fuel is mainly in the form of glucose, carbohydrates, and fat.  Each life function performed by the body relies on a specific type of fuel.  For example the brain only uses glucose.

mouth and teeth  peristalsis  small intestine  nutrients

stomach  waste