BSC 2011 Lecture Notes - Lecture 11: Thermal Conductivity, Blubber, Frostbite
3 Oct 2016
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All living systems depend on a relatively narrow range of internal temps: most cells only survive between 0-40 degrees c. Hold internal environment constant regardless of external environment. Keep body temp at constant temp (homeostasis: thermoconformers (poikilotherms) Body temp depends on heat: gained from the environment, lost to the environment, generates as a metabolic by-product. Food + o2 atp + heat +co2 +h2o: heat in must = heat out for homeostasis. Endotherms: gain most of their heat through their own metabolism, homeotherms tend to be endotherms (not same though) Ectotherms: gain most of their heat from external sources, lower metabolism, pokilotherms tend to be ectotherms (not same though) Brown fat: found in mostly newborns, bad at making atp, most of the products gets lost as heat. Males: in warm temps endotherms must lose excess metabolic heat. Must up metabolism to produce atp which produces more heat.
