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The Digestive System has two major parts:
- - The gastriointestinal system or the Gi tract
- - Set of accessory organs
Begins at the oral cavity, winds through the abdominal cavity, and ends at the anus.
The major accessory organs include the pancreas, the liver, and the gallbladder.
Set of accessory organs
Together the GI tract and the accessory organs carrry out five basic processes
- - ingestion: foods and liquids are taken into the mouth and eaten
- - mixing: the smooth muscle sin the walls of the GI tract mixes the food and sends it on its way through the GI tract
- - digestion: food is broken down by both mechanical and chemical processes.
- - absorption: the epithelial cells lining the GI tract absorb the digested food molecules and pass them to the blood or lymph.
The GI tract is composed of four layers:
- - mucosa
- - submucosa
- - muscularis
- - serosa
Innermost layer composed of mucus membrane. This slippery smooth layer allows ingested food to move along the tract without tearing it.
Under the mucosa this includes the glads, nerves, and blood supply for the tract itself.
Gives the tract the ability to move substances lengthwise. It is mostly composed of one layer of longitudinal muscle above another layer of circular muscle.
Is a slippery membrane that permits the tract to move inside the abdominal cavity without catching or causing discomfort.
Rhythmic muscular contractions of a tube that force contents toward the open end.
Soaked until soft and then separated into constituent parts.