DigestiveSystem The digestivesystem is one of the largest organ systems in the human body.
The digestivesystem not only effectively chemically reduces the compounds in food into their fundamental building blocks, but also acts to retain water and excrete undigested materials.
The functions of the digestivesystem can be summarized as follows: ingestion (eat food), digestion (breakdown of food), absorption (extraction of nutrients from the food), and defecation (removal of waste products).
The digestivesystem consists of a group of organs that form a closed tube-like structure called the gastrointestinal tract (GI tract) or the alimentary canal .
Animals use the organs of their digestive systems to extract important nutrients from food they consume, which can later be absorbed.