Nutrient_digestion_presentation

Nutrient_digestion_presentation - Chemical digestion and...

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Chemical digestion and absorption in the GI tract Carbohydrates Proteins Lipids Minerals Vitamins Water
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Nutrients A nutrient is a chemical whose absence from the diet will result in significant changes in health safe estimate of daily intake that meets standard needs is a recommended daily allowance (RDA) There are 6 major classes: carbohydrates, proteins, lipids, minerals, vitamins, water
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Carbohydrates Disaccharides = table sugar, maltose, lactose Found in 3 places in the body muscle and liver glycogen, and blood glucose regulated by many hormones RDA is 130 -175 g/day Functions fuel: neurons, RBCs, fetus and placenta structure: nucleic acids, glycoproteins & glycolipids, ATP
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Carbohydrates Digestion Mouth - salivary amylase (slightly acidic) Stomach - only in the middle of food mass by salivary amylase Small intestine Pancreatic amylase forms oligosaccharides Complete digestion is accomplished by brush border enzymes by forming monosaccharides
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Carbohydrate Absorption Sodium-glucose transport proteins in membrane help absorb glucose Fructose absorbed by facilitated diffusion then converted to glucose inside the cell Absorbed into the blood stream Liver
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Have You Had Your Fiber Today? All animals lack the enzymes necessary to digest cellulose. In our case it simply passes through our gut and out of the body. We call it fiber or roughage (RDA is 30 g/day)
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Proteins O.8 g/kg Found mostly in skeletal muscles Functions structural role in all cell membranes fibrous proteins (collagen, elastin & keratin) globular proteins: antibodies, hormones, myoglobin, plasma proteins maintain blood osmolarity & viscosity
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This note was uploaded on 06/28/2008 for the course KINS 2532 taught by Professor Sturges during the Spring '08 term at Georgia Southern University .

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Nutrient_digestion_presentation - Chemical digestion and...

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