01202011SPRNTR342BBversion-Digestion

01202011SPRNTR342BBversion-Digestion - Click to edit Master...

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Click to edit Master subtitle style NTR 342 Reading: Gropper 4th ed, Ch 2, pp. 24–39, 45–49, 51–53 Gropper 5th ed, Ch 2, pp. 33–46, 53–57, 59–61
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NTR 342 22 Today’s Lecture Review gross and microanatomy of the GI tract and accessory organs Know organ sites for the major steps of digestion Know the four mechanisms of nutrient absorption
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NTR 342 33 Food A complex mixture of nutrients and non- nutrients; must be broken down into smaller units to be absorbed and used by the body: Carbohydrate → simple sugars Protein → amino acids Lipid → fatty acids, glycerol, monoglycerides Minerals/vitamins → released from proteins
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NTR 342 44 Nutrient Absorption Factors influencing absorption speed and quantity include: Nutrient need (amount available in the body) Input from autonomic nervous system Hormones
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NTR 342 55 Digestion: 3 Modes Mechanical Chemical Biochemical
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NTR 342 66 Digestive System System that carries out digestion and absorption Gastrointestinal (GI) tract/ Alimentary canal (mouth to anus) Accessory organs Tongue, salivary glands, liver, pancreas, gallbladder
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NTR 342 Path of Food through the GI tract mouth pharynx esophagus stomach small intestine large intestine anal canal Produces peptidases, maltase, lactase Produces pepsin, HCl 7
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NTR 342 Accessory Organs and Glands salivary glands liver pancreas gall bladder Produce salivary amylase Produces pancreatic amylase, trypsin, lipase Produces bile Stores bile
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NTR 342 Process of Digestion and Absorption Mouth Teeth chew food into smaller pieces Salivary amylase (enzyme in saliva) begins starch digestion Tongue mixes food with saliva to form bolus to be swallowed Starch in bun has been broken into smaller chains of sugars 9
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NTR 342 Process of Digestion and Absorption Stomach HCl acid unfolds proteins Pepsins (enzymes) begin protein digestion, breaking some peptide bonds Gastric lipase– begins
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This note was uploaded on 05/10/2011 for the course NTR 342 taught by Professor Tillman during the Spring '09 term at University of Texas at Austin.

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01202011SPRNTR342BBversion-Digestion - Click to edit Master...

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