iphy 3430 2-1-11

iphy 3430 2-1-11 - IPHY 3430 2-1-11 Enzymatic Digestion in...

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1 IPHY 3430 2-1-11 Enzymatic Digestion in Small Intestine 1. Proteins degraded to small polypeptides 2. Carbohydrates degraded to disaccharides 3. Lipids must receive special treatment before they can be attacked by enzymes. Fat digestion: 1. Bile salts and lecithin emulsify lipid particles (micelle) 2. Lipase breaks down to monoglycerides and free fatty acids.
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2 Epithelial cell Mucous cell Central lacteal Capillaries Crypt of Lieberkühn Arteriole Venule Lymphatic vessels Microvilli (brush border) Villus Epithelial cell
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3 Absorption of nutrients 1. Small peptides. A. Peptides broken down to amino acids by aminopeptidases in the epithelial wall or by intracellular peptidases. B. Most amino acids are absorbed into epithelial cell by active transport (with expenditure of ATP and co- transport of Na+ C . Cl- and water follow Na+ into epithelial cell. D. Amino acids exit cell via passive carrier molecules and into blood. Na+ exits by active transport, Cl- and water follow. 2.
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iphy 3430 2-1-11 - IPHY 3430 2-1-11 Enzymatic Digestion in...

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