GIT (mouth to anus)
- To regulate the intake, processing and absorption of ingested nutrients and disposal of waste products.
- Several specific processes occur during the passage of food – movement (due to peristalsis of the gut), secretion, digestion, absorption and excretion
- All these processes must work well in order for the gut to achieve its ultimate role in the nutritional state of the body
Main functions of specific components:
- Oesophagus – Conduit between oral cavity and stomach
- Stomach – Storage, acid and pepsin secretion for early digestion
- Small bowel – Most of the action happens here. Digestion (enzymes provided by pancreas; bile acids for fat emulsification provided by liver) and absorption of nutrients.
- Colon – Storage of digested material, small amount of water absorption