1. Human Anatomy and Physiology An overview of digestion

2. Anatomy overview

3. Functions 1. Ingestion – mouth 2. Motility Maintain muscle tone A. Propulsive movement: unidirectional esophagus, large intestine B. Mixing movement: bidirectional stomach, small intestine

4. Functions 3. Digestion Mechanical Mouth (chewing), stomach (churning), small intestine (segmentation) Chemical Passage across plasma membranes Carbohydrates: tri-, disaccharides to mono- Proteins: into amino acids Fats: monoglycerides and fatty acids

5. 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

6. Small intestine anatomy 1 2 3 4

7. Absorption Intestinal villi and microvilli

8. Absorption through villi Esophagus Stomach

9. Absorption through villi Small intestine

10. Absorption through villi Large intestine

11. 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