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The Digestive System

The Digestive System. Functions of the Digestive System. Ingest food Break down food Digestion Physical Chemical Absorb nutrients Eliminate non-digestible waste. Anatomy of the Digestive System. Alimentary canal Accessory organs. Anatomy of the Digestive System. Oral Cavity Tongue

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The Digestive System

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  1. The Digestive System

  2. Functions of the Digestive System • Ingest food • Break down food • Digestion • Physical • Chemical • Absorb nutrients • Eliminate non-digestible waste

  3. Anatomy of the Digestive System • Alimentary canal • Accessory organs

  4. Anatomy of the Digestive System • Oral Cavity • Tongue • Skeletal muscle • Papillae • Frenulum • Hard palate • Soft palate • Uvula http://www.drranzino.com/SUPPORTING_PAGES/Resize_of_Oral_cavity.jpg

  5. Anatomy of the Digestive System • Oral Cavity • Salivaryglands • Saliva • Amylase • Moistens • Lysozyme and antibodies

  6. Anatomy of the Digestive System • The Pharynx • Swallowing • Voluntary phase • Reflex action – once food or drink is pushed back to the oropharynx

  7. Anatomy of the Digestive System • The Esophagus • Muscular tube • Peristalsis • Esophageal sphincter https://www.google.com/health/ref/graphics/8756.jpg

  8. Anatomy of the Digestive System • The Wall of the Alimentary Canal • Mucosa • Epithelium • Glandular cells • Goblet cells • Submucosa • Loose connective tissue

  9. Anatomy of the Digestive System • The Wall of the Digestive Tract • Muscularis • Serosa • squamous epithelium • Or Adventitia • Connective tissue

  10. Anatomy of the Digestive System • The Stomach • J-shaped organ • Regions • Rugae • Storage • proteins

  11. Anatomy of the Digestive System • Peritoneum • Parietal • Visceral

  12. Anatomy of the Digestive System • The Small Intestine • Regions • Duodenum • Glands secrete mucus • Receives pancreatic secretions and bile • Jejunum • Ileum

  13. Fig 15.6 http://apps.uwhealth.org/adam/graphics/images/en/8735.jpg

  14. Anatomy of the Digestive System • Wall of the Small Intestine • Circular folds • Villi • Microvilli

  15. Anatomy of the Digestive System • The Large Intestine • Cecum • appendix • Colon • Rectum • Anal canal

  16. Anatomy of the Digestive System • Feces • Three-quarters water • One-quarter solids • Bacteria • Fiber and other indigestible remains

  17. Accessory Organs of Digestion • Pancreas • Endocrine • pancreatic islets • insulin • Glucagon • Exocrine • Pancreatic juice

  18. Accessory Organs of Digestion • The Liver • Structure • Two main lobes • Bile ducts form common hepatic duct

  19. Accessory Organs of Digestion • The Gallbladder • Store bile • Bile small intestine

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