The digestive systems main function is to break up food then prepare the energy,
vitamins, and minerals it gets from food for absorption by the body. However in the
process of this the digestive system also makes a substance simply called waste.
Waste by definition is unneeded lost materials. The human body will remove all the
nutrients and energy from food, but after all usable substance in the food is gone, the
rest must be excreted. If the task is not completed the digestive tract would
quickly back up and the human body cannot survive. See also excretory system.
mouth and
teeth peristalsis small intestine nutrients
stomach waste
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