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Pharynx

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  1. Pharynx

  2. PHARYNX • Passage way for food and liquid. • In both digestive and respiratory systems.

  3. What can you see?

  4. PHARYNX • Palatopharyngeal arch: When food touches it, swallowing initiates.

  5. PHARYNX • Tonsils: Lymph tissue (mouth defense) • Tonsillitis, tonsillectomy

  6. Cracker vs. Water • Follow the directions in this mini-lab. Answer the questions in your lab book.

  7. Esophagus

  8. Esophagus • Leads the pharynx to the stomach. • Tube of muscle

  9. Esophagus • Deglutition: swallowing • Under autonomic control (no control)

  10. Deglutition • 1. Uvula moves up, covers nasal passage • 2. Pharynx moves up and the epiglottis covers respiratory system.

  11. Peristalsis • Bolus pushed through by a rhythmic smooth muscle contraction. • Reverse peristalsis???

  12. Heartburn • Stomach acid bubbles up into esophagus and burns layers of esophagus.

  13. Normal esophagus Esophagus

  14. Heartburn

  15. Esophagus

  16. Esophagus

  17. Esophagus

  18. Esophagus

  19. Esophagus

  20. Newspaper article Esophagus

  21. Stomach

  22. Stomach: COLOR • A. Fundus B. Body • C. Pylorus • D. Pyloric sphincter • E. Cardia

  23. Stomach • J-shaped • Slightly on left side of the body

  24. Stomach • Functions: • 1. Physical breakdown (Muscular) 3 layers of powerful muscle

  25. Stomach • 2. Chemical breakdown (acid/enzyme)

  26. Stomach • 3. Storage (holds about 1.5 liters) • Like….

  27. Kobayashi • Worlds greatest eater! • 5’7’’ 130lbs

  28. Kobayashi • 18 pounds of cow brains in 15 min • 53 hot dogs and buns in 12 min • 20 pounds of rice in 30 min

  29. Kobayashi • Once ate at a all you can eat buffet and gained 26 pounds at one sitting!!

  30. Stomach • Parts: • Fundus • Body • Pylorus “ gate guard”

  31. Stomach • Openings: • Sphincter: muscular ring that contracts to close the entrance or exit of an internal passageway.

  32. STOMACH • Cardia (e): Connects esophagus to stomach • Near ??

  33. Stomach • Pyloric Sphincter (d): Regulates flow of chyme between stomach and S.I. • Autonomic control

  34. Stomach • Gastric Mucosa: • Epithelial cells full of mucosa cells • Lining of the stomach • Stretch receptors

  35. Stomach • Gastric Mucosa: • Secretes a protective mucous (protects from acid, enzymes, abrasive material)

  36. Stomach • Color code the lining of the stomach. • Figure 1 = g • Figure 2 = h, i, j

  37. Stomach • Rugae (ROO-ge) • Wrinkles, very folded

  38. Stomach

  39. Stomach • Gastrin: Hormone released when food enters stomach. • Stretch receptors in the stomach wall trigger gastrin.

  40. Stomach • Gastrin: Stimulates the gastric gland

  41. Stomach • Chyme: A soupy mixture of food + gastric juices after they are combined • Vomit

  42. Stomach • Gastric Glands: Responsible for secreting gastric juices. • 1.5 liters per day

  43. Gastric Gland • Contain 2 types of secreting cells • Parietal and Chief

  44. Parietal cells 1. Releases HCl for breakdown • 2. killing microorganisms