Presentation 06 - Human Digestion

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Presentation 06 - Human Digestion

  1. 1. Human digestion<br />
  2. 2. Human digestive system (General plan)<br />Accessory digestive organs<br />
  3. 3. Sites of digestion<br />Polysaccharides<br />(starch, glycogen)<br />Disaccharides<br />(sucrose, lactose)<br />Salivary amylase<br />Smaller polysaccharides,<br />maltose<br />Proteins<br />Polysaccharides<br />Pepsin<br />Pancreatic amylase<br />Small polypeptides<br />Maltose and other disaccharides<br />Pancreatic trypsin and chymotrypsin<br />DNA, RNA<br />Fat globules <br />Pancreatic<br />nucleases<br />Bile salts<br />Disaccharidases<br />Fat droplets <br />Smaller polypeptides<br />Nucleotides<br />Pancreatic lipase<br />Glycerol, fatty<br />acids, glycerides<br />Monosaccharides<br />Nucleotidases<br />Small peptides<br />Nucleosides<br />Dipeptidases, carboxypeptidase, aminopeptidase<br />Nucleosidases, phosphatases<br />Nitrogenous bases,<br />sugars, phosphates<br />Amino acids<br />
  4. 4.
  5. 5. Digestion in the Mouth<br />Salivary glands<br />Water<br />Some enzymes<br />Salivary amylase<br />Lysozyme<br />Mucus or mucin<br />Teeth<br />
  6. 6. Swallowing: from mouth to stomach<br />
  7. 7. Digestion in the Stomach<br /><ul><li>Muscular sac
  8. 8. Churns & mixes food
  9. 9. Gastric glands
  10. 10. Parietal cells HCl, intrinsic factor
  11. 11. Goblet cells mucus
  12. 12. Chief cells pepsinogen, weak gastric lipase
  13. 13. Gastrin
  14. 14. Hormone
  15. 15. Controls gastric juices
  16. 16. Comes out as chyme (2-6 hours)</li></li></ul><li>Liver<br /><ul><li>Secretes bile</li></ul> (stored in gall bladder)<br /><ul><li>Emulsifies fats</li></ul>Gallbladder<br /><ul><li>Stores, concentrates, and releases bile into duodenum
  17. 17. Stimulated by the hormone cholecystokinin (CCK)</li></li></ul><li>Pancreas<br />Exocrine function<br />Acinar cells secrete pancreatic juice<br />Amylase<br />Lipase<br />Trypsin<br />Chymotrypsin<br />Carboxypeptidase<br />Nuclease<br />NaHCO3<br />Secretin and cholecystokinin (CCK)fr intestinal wall stimulates PJ production<br />
  18. 18.
  19. 19. Absorption in the small intestine<br />
  20. 20. Reabsorption and elimination in the large intestine<br /><ul><li>Areas of the colon
  21. 21. cecum
  22. 22. rectum
  23. 23. anus
  24. 24. Absorption of water and electrolytes
  25. 25. Concentration & elimination of solids
  26. 26. Home for bacteria
  27. 27. folic acid
  28. 28. vitamin K
  29. 29. several B-vitamins
  30. 30. gases</li></li></ul><li>Liver<br />Entero-<br />gastrone<br />Gall-<br />bladder<br />Gastrin<br />CCK<br />Stomach<br />Pancreas<br />Secretin<br />Duodenum<br />CCK<br />Key<br />Stimulation<br />Inhibition<br />

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