About the Digestive System



Almost all animals have a tube-type digestive system in which food enters the mouth, passes through a long tube, and exits as feces
(poop) through the anus. The smooth muscle in the walls of the
tube-shaped digestive organs rhythmically and efficiently moves the
food through the system, where it is broken down into tiny absorbable
atoms and molecules.

During the process of absorption, nutrients that come from the food
(including carbohydrates, proteins, fats, vitamins, and minerals) pass
through channels in the intestinal wall and into the bloodstream. The
blood works to distribute these nutrients to the rest of the body. The
waste parts of food that the body can't use are passed out of the body
as feces.

Every morsel of food we eat has to be broken down into nutrients
that can be absorbed by the body, which is why it takes hours to fully
digest food. In humans, protein must be broken down into amino acids,
starches into simple sugars, and fats into fatty acids and glycerol.
The water in our food and drink is also absorbed into the bloodstream
to provide the body with the fluid it needs.

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