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Lab 8

Lab 8. Digestion. Lab 8: Digestion. Histology Parotid gland, esophagus, stomach, duodenum, jejunum, ileum, colon, liver, pancreas Alimentary canal histological layers Models of the digestive system PhysioEx: Chemical and Physical Processes of Digestion

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Lab 8

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  1. Lab 8 Digestion

  2. Lab 8: Digestion • Histology • Parotid gland, esophagus, stomach, duodenum, jejunum, ileum, colon, liver, pancreas • Alimentary canal histological layers • Models of the digestive system • PhysioEx: Chemical and Physical Processes of Digestion • Learn to understand and interpret data tables + simulated test tube results for salivary amylase • Learn about the major digestive enzymes and their substrates • Examine the effect of heating, cooling, and pH on enzyme activity • Use indicators of enzyme activity (IKI, Benedict’s, etc.)

  3. General Structure • Digestive organs divided into 2 main groups • GI (alimentary) tract • Accessory structures • cheeks, teeth, tongue, salivary glands • liver, gallbladder, pancreas

  4. General Organization of GI Tract

  5. Histology of the GI Tract #55: salivary glands #56: esophagus #57: stomach #58: small intestine – duodenum #59: small intestine - jejunum #60: small intestine – ileum #54: liver #39: pancreas #61: large intestine

  6. Salivary Glands MA = mucous acinus; SA = serous acinus; ducts lined by simple cuboidal epithelium

  7. Parotid Salivary Gland

  8. Submandibular and Sublingual Salivary Glands

  9. Esophagus

  10. Esophagus

  11. Esophagus – 4 tissue layers

  12. Esophagus

  13. Esophagus

  14. Transition Zone Simple columnar Stratified squamous

  15. Stomach

  16. The interior wall of the stomach consists of a series of folds, called rugae.

  17. Rugae in Cross Section

  18. Rugae

  19. Detail of Rugae

  20. Fundus:gastric glands

  21. Gastric Glands

  22. G Cells produce Gastrin

  23. Duodenum

  24. Duodenum

  25. Villi (multicellular)

  26. Duodenum

  27. Villi and Intestinal Crypts

  28. Duodenum

  29. Jejunum

  30. Jejunum

  31. Ileum with MALT = Mucosal Associated Lymphatic Tissue

  32. Ileum

  33. Ileum with Peyer’s Patches = aggregated lymphatic nodules

  34. Ileum

  35. Ileum and Plicae Circularies Lacteal

  36. Ileum Diffuse Lymphatic Tissue Lymphatic Nodule with Germinal Center

  37. Liver in cross section

  38. Liver Lobules

  39. Liver Parenchyma

  40. Hepatocytes

  41. Liver Lobule

  42. Hepatic Triad

  43. Stellate Reticuloendothelial Cell monocyte-derived fixed macrophages (aka Kupffer cells)

  44. Pancreas

  45. Pancreas Exocrine: acinar cells Endocrine: islet cells

  46. Pancreas Acinar Cells

  47. Large Intestine(Colon)

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