Secretin - a hormone that stimulates basic pancreatic juices

1. Secretin- a hormone that stimulates basic pancreatic juices • Gastrin-a hormone that increases the production of digestive juices • Cholecystokinin- a hormone that stimulates digestive pancreatic juices and bile release • Pepsin-an enzyme that digests proteins • Amylase-an enzyme that digests carbohydrates • Lipase- an enzyme that digests lipids

2. Digestive System Does anyone read this?

3. Outline • Week One • Diagrams & layers of digestive system • Tongue, palate, teeth & salivary glands • Pharynx, esophagus, stomach • Pancreas, liver, gallbladder & intestines • Week Two • Diseases and treatments • Clinical Rounds • Review • TEST (MARCH 1st!)

4. Gallbladder, Liver and Pancreas • No food goes through these • Secretions  ducts S.I. • Food that enters the small intestine from the stomach is called chyme (an acidic paste)

5. Pancreas • Makes digestive juices for organic compounds • Lipase, cholecystokinin & nuclease • Secretin stimulates basic solution to reduce pH of chyme

6. Liver • Versatile organ! • Tiny units called hepatic lobules • Secretes bile •  hepatic duct • Lipid digestion • Other roles: creates phospholipids, cholesterol, filters blood, turns carbs to fats, makes parts of blood, stores iron/vitamins, filters toxins

7. Gallbladder • Overflow storage site for bile • Release of bile controlled by cholecystokinin

8. The intestines

9. Peristalsis • Rhythmic movement of muscles that moves food through the large and small intestines

10. Small Intestine • Chyme here • Three parts • Duodenum • Ilium • Jejunum • Coated with villi to increase SA

11. Small Intestine’s Role • Finish digestion • Absorb nutrients • Move food remains to large intestines • Secrete watery fluid to help absorb digested nutrients • Note: If food is rushed through small intestines, there will be low nutrient absorption, increased defecations & diarrhea

12. Large Intestine • Absorb water & electrolytes • Three parts • Cecum • Colon • Rectum

13. Name as many components of their trip that you recognize as part of the digestive unit These can be facts you thought of, names or functions of structures, etc. Magic School Bus!

14. Activity • Trace the path of a piece of food through the digestive system. List the sites that you see (in order) and what is occurring there.

15. Flashcards • Hormones: gastrin, cholecystokin, secretin (other side is what organs they effect and what it makes they secrete). • Enzymes: Lipase, amylase, nuclease, bile salts, pepsin