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5/23/2017 Title: Anat & Phys 3/13/07 Objectives: . Class Topics • Notes – – – – – Liver Hepatocytes Gallbladder Hormones Nutrient Absorption "No one can make you feel inferior without your consent." Eleanor Roosevelt Tuesday, May 23, 2017 8:51 AM Page: 1 5/23/2017 Class Assignments What By When • Comparative anatomy essay – cellulose digestion 3/13/07 • Due this class period • Due next class period • Due in the future Page: 2 5/23/2017 Liver • Largest visceral organ • divided into two lobes – each lobe contains 100,000 hepatocytes • Hepatocyte functions – – – – clean blood store iron and other heavy metals forms bile - sent to gallbladder drug inactivation Page: 3 5/23/2017 From: http://faculty.southwest.tn.edu/rburkett/A&P2%20Digestive%20System%20Lab.htm Page: 4 5/23/2017 Digestive function of Hepatocytes • • • • Carbohydrate metabolism Lipid metabolism amino acid metabolism vitamin storage – fat soluble vitamins • A,E,D,K, B12 • Acquire nutrients directly from small intestine via hepatic portal vein Page: 5 5/23/2017 Gallbladder • Releases bile through common bile duct – guarded at the duodenum by sphincter of Oddi • Bile function – Break open lipids to lipase can digest • Bile salts are recycled by ileum • Gallstone - bile salt precipitates block common bile duct Page: 6 5/23/2017 Hormones • Gastrin – Released by stomach – causes release of gastric juices and increases motility – released at sight, smell, or ingestion of food • Secretin – stimulates the release of buffers and water released into duodenum Page: 7 5/23/2017 Hormones • Cholecystokinen (CCK) – secreted when chyme hits duodenum – Releases sphincter of Oddi – Stimulates the production of pancreatic juices – inhibits gastric activity Page: 8 5/23/2017 Nutrient absorption • Carbohydrates (monosaccharides) – through microvilli to blood stream – facilitated diffusion • Proteins (amino acids) – through microvilli to blood stream – facilitated diffusion • Lipids (triglycerides) – through microvilli to lymph – diffusion - nonpolar substances Page: 9 5/23/2017 From: http://www.agen.ufl.edu/~chyn/age2062/lect/lect_20/digproc.gif Page: 10 5/23/2017 Page: 11 5/23/2017 Lab • Lower Digestive Tract • Complete through #6 – If time allows Page: 12