BIOL370 Lecture Notes - Lecture 11: Basal Metabolic Rate, Myosin Head, Respirometry
24 Dec 2012
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Document Summary
Hypometabolism is a strategy for reducing energy expenditure in response to adverse environmental. Lecture 11: adjusting metabolism conditions: torpor, hibernation, estivation. Examples can be found in almost all animal orders. Regulation of hypometabolism is multi-part: hormonal input, reversible phosphorylation, selective transcription. Metabolism: sum of all processes by which energy is acquired, transformed, and channeled into useful functions to sustain life (energy for growth, reproduction, structural maintenance, & responses to the environment) Food energy metabolizable energy fuel metabolic processes (heat is generated as a waste product) Metabolic rate = rate of energy consumption (energy/unit time: determines how much food an animal needs, the total activity of all physiological mechanisms & the pressure on energy supplies in the ecosystem. Respirometry: measures the animal"s rate of respiratory gas exchange (o2 consumption & co2 production) Chemical reactions are aerobic (oxidative phosphorylation, not anaerobic glycolysis) Heat produced with volume of o2 consumed is constant regardless of different types of energy substrate.
