1. Digestion in… …the small & large intestines 9.5

2. Small Intestine about 2.5 cm in diameter up to 7 m in length duodenum: first 25- 30 cm: digestion jejunum: digestion/ absorption ileum: absorption

3. Accessory Organs

4. pH of Small Intestine chyme has pH of about 2.5 converts prosecretin into secretin, which causes pancreas to release bicarbonate ions (increasing pH to 9.0) pepsin is inactivated, protecting the small intestine

5. Pancreatic Secretions chyme enters duodenum cholecystokinin (CCK) is released into blood by cells in duodenum CCK causes pancreatic cells to release various substances

6. Carbohydrate Digestion pancreatic amylase is released into duodenum continues breakdown of starch started in the saliva

7. Protein Digestion trypsinogen released by pancreas activated to trypsin by enzyme enterokinase trypsin continues to break down proteins into amino acids

8. Lipid Digestion bile is produced in liver & stored in gall bladder and released into the duodenum bile breaks down large fat globules lipases secreted by pancreas break down fats into smaller molecules

9. Small Intestine - Absorption

10. Absorption passive transport (including osmosis) facilitated diffusion active transport nutrients are absorbed in capillary networks

11. Large Intestine up to 7.6 cm in diameter about 1.5 m in length

12. Large Intestine most of the water is absorbed 500+ species of bacteria produce essential vitamins K and some B. feces are egested through the anus

13. Resources… McGraw-Hill Ryerson animation & quiz (good overview, but not a lot of detail about the enzymes & secretions)animation & quiz Another McGraw-Hill digestion quizquiz

14. Let’s review…

16. Review… These quizzes are good for reviewing anatomy, but not the enzymes/secretions: http://kidshealth.org/kid/htbw/DSquiz.ht mlhttp://kidshealth.org/kid/htbw/DSquiz.ht ml http://www.softschools.com/quizzes/scie nce/digestive_system/quiz751.htmlhttp://www.softschools.com/quizzes/scie nce/digestive_system/quiz751.html

17. And finally…science meets art