205textnotes48 - pancreatic and common bile duct) -...

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chymotrypsinogen ===== trypsin ======> chymotrypsin procarboxypeptidase === trypsin ======> carboxypeptidase proteins and peptide chains are broken down into amino acids or short amino acid chains (Figure 20-12) by trypsin, chymotrypsin and carboxypeptidase and aminopeptidase (brush border protease) Transport in and out of epithelial cells (Figure 20-14) . - amino acids are transported by secondary active transport along with Na + - some large intact proteins can cross epithelium by endocytosis and exit via exocytosis Accessory Organs to the Small Intestine Pancreas : : endocrine -> insulin, glucagon, somatostatin : exocrine -> aqueous solution (water, HCO 3 - and Na + ), digestive enzymes - exocrine secretions are stimulated by secretin - secretions are via pancreatic duct regulated by sphincter of Oddi (entrance to small intestine, convergence of
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Unformatted text preview: pancreatic and common bile duct) - neutralizes acidic chyme - PNS activity increases pancreatic aqueous secretions - SNS activity decreases pancreatic aqueous secretions - CCK also increases aqueous pancreatic secretions - digestive enzymes are released under stimulus by CCK - pancreatic amylase - breakdown of carbohydrate - pancreatic lipase - fat digestion - proteases - breakdown of proteins Liver : (Figure 20-18)- hepatocytes produce bile - bile composed of bile acids, bilirubin, HCO 3-, cholesterol and lecithin (phospholipid) - bile is stored and concentrated in gall bladder when sphincter of Oddi is closed....
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This note was uploaded on 12/26/2011 for the course KIN 205 taught by Professor Blaber during the Fall '09 term at Simon Fraser.

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