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13 Cards in this Set
- Front
- Back
function
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function:
- conversion of macromolecules into absorbable micromolecules via mechanical and chemical means - diet--> circulatory system |
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3 processes
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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 |
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control systems
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control systems:
- hormonal and neural: 1. adjust GI activity to quality/ quantity of incoming food 2. facilitate communication b/w GI sections |
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mouth
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mouth:
- mechanical breakdown of food - addition of saliva as lubricant |
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esophagus
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esophagus:
- conduit mouth--> stomach |
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stomach
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stomach:
- chem digestion of proteins - liquefecation of food - start of protein digestion |
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liver/ bile
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liver/bile:
- provision of bile salts for digestion/ absorption of fats |
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pancreas
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pancreas:
- provision of major digestive enzymes |
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SI
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SI:
1. provision of enzymes 2. chemical digestion 3. absorption of nutrients and water |
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LI
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LI:
1. absorption of water 2. feces formation 3. bacterial fermentation: major spp differences, all spp |
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Rumen/ forestomach
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rumen/ forestomach:
- bacterial fermentation of nutrients - absorption of fermentation products |
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proteins
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proteins:
4-20aa: oligopeptide > 20 aa: polypeptide |
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lipids
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lipids:
- average 18-20 aa |