1. Digestion, Absorption and Transport

2. Digestion Basic anatomy of the GI tract
mouth  esophagus  stomach  small intestine  large intestine  rectum  anus
lumen

3. GI Tract Anatomy

5. Digestion
Mouth
Tongue
Teeth
Mastication (chewing)

6. The Teeth

7. Digestion
Pharynx
Epiglottis
Esophagus
Esophageal sphincters
Bolus

8. Digestion
Stomach
Chyme
Pyloric sphincter

9. Stomach Muscles

10. Digestion
Small intestine
Duodenum
Jejunum
Ileum

11. Digestion
Gallbladder
Pancreas

12. Digestion
Large intestine = colon
Ileocecal valve
Appendix
Rectum
Anus

13. Peristalsis & Segmentation

14. Muscular Action of Digestion
Segmentation

15. Muscular Action of Digestion
Sphincter contractions
Reflux

17. Secretions of Digestion
Catalysts
Hydrolysis
Digestive enzymes

18. Secretions of Digestion
Saliva
Salivary glands
Water, salts, mucus, enzymes

19. Secretions of Digestion
Stomach
Gastric juice
Gastric glands
Water, enzymes, hydrochloric acid (HCl)

20. Secretions of Digestion
Stomach
Goblet cells
Mucus

21. Secretions of Digestion
Pancreas
Pancreatic juice
Enzymes, bicarbonate

22. Secretions of Digestion
Liver
Bile
Emulsifier
Gallbladder

23. The Final Stage
Stools
Colon
Fermentation of undigested residues

25. Digestion of a Sandwich (1)

26. Digestion of a Sandwich (2)

27. Absorption

28. Absorption in the Small Intestine
Villi
Microvilli
Capillaries and lacteals
Chylomicrons
Crypts

29. Small Intestinal Villi

30. The Small Intestinal Villi, cont’d

31. Circulatory Systems Vascular system Heart Arteries Capillaries Veins
Lymph system-not part of it!

33. Circulatory Systems Vascular system
Portal vein-blood from GI tract toward capillaries in the liver.
Hepatic vein-liver to heart.

34. The Liver

35. Regulation of Digest. Hormones
Gastrin-controls secretion of gastric acid
Secretin-facilitates secretion of pancreatic juice (bicarbonate)
Cholecystokinin = CCK (bile release from gall bladder, slows GI motility)