1 / 15

Chapter 21, part B

Chapter 21, part B. Digestion. Chemistry of Digestion: Fats. Bile emulsification to small fat droplets Enzymes: lipases, colipases & phospholipases Triglycerides  monoglycerides & free fatty acids. Chemistry of Digestion: Fats. Figure 21-8: Fat digestion.

Télécharger la présentation

Chapter 21, part B

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Chapter 21, part B Digestion

  2. Chemistry of Digestion: Fats • Bile emulsification to small fat droplets • Enzymes: lipases, colipases & phospholipases • Triglycerides  monoglycerides & free fatty acids

  3. Chemistry of Digestion: Fats Figure 21-8: Fat digestion

  4. Regulating Digestion: CNS and Enteric Nervous System (ENS) • Long (cephalic) reflexes: CNS, feed forward & emotional reflexes • Short reflexes – ENS ("little brain")  integration, motility & secretion: enzymes & hormone/paracrine GI peptides

  5. Regulating Digestion: CNS and Enteric Nervous System (ENS) Figure 21-9: The enteric nervous system

  6. Phases of Digestion: Overview Figure 21-11: Overview of functions in different regions of the digestive system

  7. Cephalic and Oral Phases of Digestion • Cephalic: anticipation of food • CNS  ANS long reflex • Enteric  cells short reflex • GI motility • GI secretions • Mouth: starts digestion • Grind, mix & liquefy • Saliva: water, enzymes, mucus & lysozyme

  8. Cephalic and Oral Phases of Digestion Figure 21-12: Long and short reflexes in the stomach

  9. Swallowing reflex: Soft Palate & Esophagus • Deglutition • Epiglottis • Upper esophageal sphincter • Lower esophageal sphincter • (heartburn)

  10. Swallowing reflex: Soft Palate & Esophagus Figure 21-13: The swallowing reflex

  11. Gastric Phase: The Stomach • Storage • Digestion • HCl – parietal C. • Lipase – chief C. • Pepsin – chief C. • Protect walls • HCO3- • Mucus

  12. Gastric Phase: The Stomach Figure 21-17: Integration of secretion in the stomach

  13. Gastric Phase: The Stomach Figure 21-15: The mucus-bicarbonate barrier of the gastric mucosa

  14. Regulation of the Stomach Digestive Activities • CNS – cephalic input • ENS – ANS integration w/hormones & paracrines

  15. Regulation of the Stomach Digestive Activities Figure 21-17: Integration of secretion in the stomach

More Related