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Nutrition chapter 4

Nutrition chapter 4 - METABOLISM Anabolism Build up Forms...

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METABOLISM Anabolism + Catabolism Build up Break Down Forms bonds Breaks bonds Requires Energy Releases Energy Food + Oxygen -> Carbon Dioxide Water Energy Stages of Getting Energy from Food 1. Digestion, Absorption, Transport 2. Catabolism to ACETYL CoA 3. KREBS Cycle 4. Electron Transport MACRONUTRIENT CATABOLISM- “getting to Acetyl CoA’” Carbohydrates Glycolysis (in cytosol) Breaking down glucose Can occur with or without oxygen Lipids Lipolysis then Beta-oxidation Breaking fatty acids off of glycerol, then chopping off 2 carbons at a time Needs lots of oxygen! Proteins Take nitrogen off carbon skeleton: Nitrogen disposed in urea cycle Carbons go to Krebs Cycle NADH + H + AND FADH 2 COMPOUNDS GENERATED BY: CATABOLISM OF GLUCOSE, FATTY ACIDS & AMINO ACIDS KREBS CYCLE o NADH + H + and FADH 2 carry electrons from these pathways to the electron transport chain
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o Electrons are passed down the chain to produce ATP o NADH + H + and FADH 2 contain B-vitamins CARBOHYDRATE CATABOLISM Glycolysis – in cytosol Glucose (6 C) -> 2 Pyruvate ( 3 C each) 2 P added to glucose: 1 “traps” glucose in cell 1 “primes” glucose for pathway 2 ATP used in pathway
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