Lecture Metabolism 2010

Lecture Metabolism 2010 - Energy Flow through Animal Energy...

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maintenance specific dynamic action Energy Flow through Animal Energy Metabolism Text Chapters (selected Parts)
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Energy is not notRecycled Therefore, energy must be supplied more or less continuously
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Recall the concept of a steady state: Energy Heat E in = E out organism Therefore, heat production is a measure of metabolic rate. Direct calorimetry , MR = H Assumptions: no work, no storage of energy
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Review of Cellular Energetics • Energy used to support cellular processes mostly in form of hi-energy bonds of ATP • Complex set of enzymes transfer energy liberated from oxidation of energy substrates from food ATP • Controlled process: oxidative phosphorylation glycolysis (6-C glucose two 3-C pyruvic acid) – Krebs cycle (tricarboxylic acid cycle); CO 2 – oxidative phosphorylation ATP, H 2 0 Text pp. 46 – 64
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Review of Cellular Energetics • ATP is source of immediate energy • ATP can be rapidly depleted and must be regenerated from “phosphate reservoirs” (e.g. creatine phospate in muscle) or liberation of energy from substrates within the cell (carbohydrates, lipids) • Oxidative phosphorylation requires oxygen, so oxygen consumption is an indirect measure of metabolic rate Indirect Indirect calorimetry calorimetry , , MR = V 02 = H
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Lecture Metabolism 2010 - Energy Flow through Animal Energy...

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