Essentially, food is digested and broken down with acids and enzymes that the GI tract secrets. The nutrients from this broken down food are then absorbed into the blood stream for the bodies use. The food matter that the body does not want is then expelled as feces. That is it in a nutshell.
For a far greater explanation, I added a link below you can peruse.
Contraction of GI tract are: peristalsis and segmentation.
The stomach has the thickest walls and the strongest muscle in all the GI tract organs. : )
The GI (Gastrointestinal) tract or the Digestive Tract
The anus
GI tract, GIT, digestive tract, digestion tract, alimentary canal
The function of the projections of the mucosa of the GI tract is secretions and absorption. Digestion is also aided by these projections.
The GI (Gastrointestinal) tract or the Digestive Tract
Neutralize acids.
it is the mucosa
"Entro" refers to the gastrointestinal tract. Enteritis, for example, is inflammation of some portion of the GI tract. Ileitis, inflammation of the ileum, would be a type of enteritis. An enteropathy would be a condition/ pathology of the GI tract which does not include enteritis/ inflammation.
Peristalis takes place in the gastrointestinal tract.
The abbreviation most often used for gastroenterologist is GI, standing for gastrointestinal. Although it's ungrammatical, health care professionals will often say, "You need to see GI," when they really mean, "You need to see the GI specialist."