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Download Comparative Vertebrate Physiology
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Human Anatomy and Physiology An overview of digestion Anatomy overview Functions 1. Ingestion – mouth 2. Motility • Maintain muscle tone • A. Propulsive movement: unidirectional • esophagus, large intestine • B. Mixing movement: bidirectional • stomach, small intestine Functions 3. Digestion • Mechanical Mouth (chewing), stomach (churning), small intestine (segmentation) • Chemical Passage across plasma membranes Carbohydrates: tri-, disaccharides to monoProteins: into amino acids Fats: monoglycerides and fatty acids Functions 4. Secretion Mouth, stomach, liver, pancreas, small intestine 5. Absorption 80% in the duodenum, rest in small and large intestine 6. Elimination of wastes Small intestine anatomy 1 2 3 4 Absorption Intestinal villi and microvilli Absorption through villi Esophagus Stomach Absorption through villi Small intestine Absorption through villi Large intestine Accessory glands • Salivary glands • Moisten, lubricate, breakdown saccharides • Pancreas • Enzymes secreted into duodenum, neutralizes stomach acid • Liver • Breakdown fats, neutralizes stomach acid • Gall bladder • Store bile made by the liver
