Biology 2601A/B Lecture Notes - Lecture 6: Mitochondrion, Gluconeogenesis, Inner Membrane
6 Oct 2015
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Homeotherm: highly stable core body temperature regardless of changing ambient temperature. Homeotherm: highly stable core body temperature regardless of ambient temperature. Metabolic rate remains constant thermal neutral zone different for every animal. Want to stay in zone blood vessels shrink. Goosebumps, hair sticks out fluff up fur (insulation) Metabolism doesn"t drop, it increases: muscles produce heat when moving will help. Seasonal variation in insulation: adding insulation increases thermal. Counter-current heat exchange (use heat from blood going to feet for example to rewarm the blood coming back from feet) Exposed body parts are often cooler than core temperature: heat and energy conservation. Testes and brains are often also kept a little cooler. Can use the blood vessels that are closer and deeper to the tissue. Left side of graph is lower critical temperature (cid:224) doesn"t represent hypothermia (when core temperature starts to change) this has to do with metabolic rate. Spend more energy to keep body cool counterintuitive producing heat.
