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Lecture_7 - Small Intestine Anatomy o Duodenum-digestion...

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Small Intestine Anatomy o Duodenum—digestion Add in lots of different digestive enzymes that break down the  macromolecules into monomers (breaking down food) o Jejunum—absorption o Ileum—absorption Lined with villi layer of tissue that gives rise to microvilli; increase in surface  area o Fig. 46-10b, p 997 Microvilli extensions of the cell membrane of the simple columnar epithelial  cells (finger-like projections; provide mass amount of surface area) o Fig 46-10c, p 997 Small Intestine surface area is about the size of a tennis court  Chemical Digestion o Crypts of Lieberkuhn contains many different digestive enzymes Proteases Work with different peptide bonds to change polymers into  monomers to be absorbed Enzymes for disaccharides Ex: Sucrase, lactase, maltase  Absorption o Lacteal Lymph capillaries that come together lymph vessels; fluid is lymph  but is carrying fat  o Fig. 46-10b, p 997  o Most food goes through lumen into simple columnar cells into blood  capillaries does not include fats (carbs, monomers, etc) Lipids do not go through the blood capillaries Fat molecules go through the lymph and carried out by the lymph  system o Lymph vessels begin in the villi and coalesce into larger and larger  vessels Hepatic Portal Vein Veins from stomach and small intestine  Transport blood to liver 
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Liver Converts excess glucose to glycogen Convert excess Amino acids to o Fatty acids o Urea 
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