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The Digestive System 3.5 & 3.6 Stages of Food Processing • ingestion • digestion • absorption • egestion Ingestion • teeth: physical breakdown of food • salivary glands: amylase in saliva breaks down starch (chemical digestion) • tongue: forms bolus, pushes it back to pharynx • esophagus: peristalsis moves bolus down http://www.youtube.com/watch?v=h0E9ITyRlh0 Digestion (Stomach) Digestion (Stomach) • gastric juices: hydrochloric acid + enzymes (e.g., pepsin) • mucus: protects lining of stomach from damage • chyme = partly digested food, water, and gastric juice that enters the small intestine Digestion (Duodenum) Digestion (Duodenum) • bile (produced in liver, stored in gall bladder): emulsifies fat • lipase, amylase, trypsin (produced in pancreas): digest fat, starch, protein • maltase, peptidases (produced in duodenum): digest maltose, polypeptides Absorption (Small Intestine) Small Intestine • up to 7 metres in length (25 cm of which is duodenum), 2.5 cm wide • villi & microvilli increase surface area for absorption Large Intestine • 1.5 metres long, 5 cm in diameter • absorbs water • helpful bacteria produces vitamins K and B Egestion Animations • Process of digestion: • http://www.youtube.com/watch?v=Z7xK YNz9AS0 • Animation & Quiz: • http://highered.mcgrawhill.com/sites/0072495855/student_view 0/chapter26/animation__organs_of_dig estion.html Is it Art?
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