1. Notes: Small Intestine Wednesday 1-6-10

4. (1) Overall Function Absorb nutrients from stomach chyme Metabolize ALL Proteins and Lipids Leave only waste and water

5. (2) Regions Duodenum: (First Chamber) – Approximately 10in long Jejunum: (Middle Section) – Approximately 7-8ft long Ileum: (Last Section) – Approximately 12ft long

7. (3) Duodenum Secretes Bile, Pancreatic Juice & Bicarbonate: – Bile = Yellow-green solution produced by the liver, stored in the gallbladder. – Pancreatic Juice = Solution produced by the pancreas, stored in the pancreas. – Bicarbonate = pH balancing compound found in the blood. Metabolize all remaining proteins and lipids.

8. (4) Bile Produced by liver, Stored by Gallbladder Contains: – Bile Salts – Waste Pigments (bilirubin) – Cholesterol & Phospholipids Function: Emulsify lipids so that they are dispersed throughout water, and can be easily absorbed.

11. (5) Pancreatic Juice Produced by pancreas Contains: – Carboxypeptidase (Protein Enzyme) – Chymotrypsin (Protein Enzyme) – Amylase (Carbohydrate Enzyme) – Lipases (Lipid Enzymes) – Nucleases (Nucleic Acid Enzymes) Function: Metabolize all remaining biomolecules.

13. (6) Bile & Pancreatic Juice Secretion Lipids & Proteins  Release of CCK (cholecystokinin) into bloodstream CCK stimulates release of bile + pancreatic juice  Out Sphincter of Oddi

15. (7) Bicarbonate HCO 3 Used to maintain pH balance within cells (and water systems). – Neutralizes acidity of chyme coming from stomach Secreted from Brunner’s Glands along Duodenum Walls.

17. (8) Jejunum Smooth Muscle with millions of microvilli: – Microvilli Absorb Nutrients – Nutrients directly deposited in blood stream – Folds in between are called “Crypts of Lieberkuhn” Crypts of Lieberkuhn: – Secrete Lysozymes to eliminate any foreign bacterial cells – Secrete Muccin to lubricate and dissolve remaining food stuff

20. (9) Ileum Smooth muscle like Jejunum: – Contains Microvilli – Absorbs all left over nutrients – Directly deposits into bloodstream Remaining “stuff” = waste