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13 Cards in this Set

  • Front
  • Back
function
function:
- conversion of macromolecules into absorbable micromolecules via mechanical and chemical means
- diet--> circulatory system
3 processes
3 processes:
1. motility: smooth m contractions crush, mix, and propel contents= mechanical digestion
2. secretions: digestive enz, mucus, ions and fluid create aqueous phase= chemical digestion
3. absorption: transport of nutrients, water, ions across epithelium into blood or lymph
control systems
control systems:
- hormonal and neural:
1. adjust GI activity to quality/ quantity of incoming food
2. facilitate communication b/w GI sections
mouth
mouth:
- mechanical breakdown of food
- addition of saliva as lubricant
esophagus
esophagus:
- conduit mouth--> stomach
stomach
stomach:
- chem digestion of proteins
- liquefecation of food
- start of protein digestion
liver/ bile
liver/bile:
- provision of bile salts for digestion/ absorption of fats
pancreas
pancreas:
- provision of major digestive enzymes
SI
SI:
1. provision of enzymes
2. chemical digestion
3. absorption of nutrients and water
LI
LI:
1. absorption of water
2. feces formation
3. bacterial fermentation: major spp differences, all spp
Rumen/ forestomach
rumen/ forestomach:
- bacterial fermentation of nutrients
- absorption of fermentation products
proteins
proteins:
4-20aa: oligopeptide
> 20 aa: polypeptide
lipids
lipids:
- average 18-20 aa