1 / 19

Digestive Hormones

Digestive Hormones. Gastrin family Gastrin and CCK Secretin family Secretin, VIP, GIP, and GLP-1 Others Motilin. PLAY. Animation: Digestive System: Control of the Digestive System. THE DIGESTIVE HORMONES. Digestion and Absorption. A villus and a crypt in the small intestine.

zeno
Download Presentation

Digestive Hormones

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. Digestive Hormones • Gastrin family • Gastrin and CCK • Secretin family • Secretin, VIP, GIP, and GLP-1 • Others • Motilin PLAY Animation: Digestive System: Control of the Digestive System

  2. THE DIGESTIVE HORMONES

  3. Digestion and Absorption A villus and a crypt in the small intestine Figure 21-13

  4. Carbohydrate Digestion: Breakdown to monosaccharide, which can be absorbed Figure 21-14

  5. Carbohydrate Absorption in the Small Intestine Figure 21-15

  6. Enzymes for Protein Digestion Figure 21-16

  7. Peptide Absorption Figure 21-17

  8. Digestion and Absorption Triglycerides digest into monoglycerides and free fatty acids Figure 21-18

  9. Digestion and Absorption of Fats Large fat droplets from stomach Bile salts from liver Bile salts from liver coat fat droplets. 1 1 2 Pancreatic lipase and colipase break down fats into monoglycerides and fatty acids stored in micelles. Emulsion Bile salts recycled Lipase and colipase 2 Micelles Lumen of small intestine 3b Monoglycerides and fatty acids move out of micelles and enter cells by diffusion. 3a 3a Smooth ER 3b Cholesterol is transported into cells by a membrane transporter. 4 Triglycerides + cholesterol + protein Cells of small intestine Chylomicron Golgi apparatus Absorbed fats combine with cholesterol and proteins in the intestinal cells to form chylomicrons. 4 5 Interstitial fluid Lacteal Capillary Chylomicrons are released into the lymphatic system. 5 Lymph to vena cava Figure 21-19

  10. Digestion and Absorption The role of bile salts in emulsions and micelles Figure 21-20

  11. Digestion and Absorption • Nucleic acids are digested into nitrogenous bases and monosaccharides • Intestine absorbs vitamins and minerals • Fat-soluble vitamins (A, D, E, K) absorbed with fats in small intestines • Water-soluble vitamins (C, B vitamins) absorbed by mediated transport • Exception: Vitamin B12when complexed to intrinsic factor, secreted in the stomach, and absorbed in ileum • Minerals absorbed by active transport

  12. Digestion and Absorption NaCl reabsorption in the small intestine and colon Figure 21-21

  13. Digestion and Absorption Summary of motility, secretion, digestion, and absorption in different regions of the digestive system PLAY Animation: Digestive System: Digestion and Absorption Figure 21-22

  14. 3 PHASES OF FOOD PROCESSING • Cephalic Phase • Gastric Phase • Intestinal Phase

  15. The Cephalic Phase • Chemical and mechanical digestion begins in the mouth • Salivary secretion under autonomic control • Softens and lubricates food • Chemical digestion: Salivary amylase and some lipase • Saliva is protection as well • Chewing: mastication

  16. Swallowing Reflex Figure 21-24, step 1

  17. Swallowing Reflex Figure 21-24, step 2

  18. Swallowing Reflex Figure 21-24, step 3

  19. Swallowing Reflex Figure 21-24

More Related