ch 9 thermoregulation - Relay for Life is COMING Start...

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1 Thermoregulation Lecture 29 5 November 2008 Relay for Life is COMING!! Start preparing for one of Cornell’s biggest events by attending the Relay for Life Kickoff! Wednesday, November 5th from 11-2 @ Ho Plaza and 6-8 @ RPU Relay for Life at Cornell is March 28th, 2009!! Bioenergetic mechanisms are inefficient Most energy is “lost” as heat Where we’re going 1. Heat exchange 2. metabolism 3. radiation 4. conduction 5. convection 6. evaporation Clicker question Last night’s exam was…? A. easier than I expected B. about what I expected C. too long D. too hard E. both C & D Metabolism Heat exchange
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2 Heat exchange T body = T ambient + metabolism +/- radiation +/- conduction +/- convection - evaporation Different animals have different strategies for T b 0 10 20 30 40 40 30 20 10 0 Ambient temperature, T a (C o ) Body temperature, T b (C o ) Regulators Endotherms Conformers Ectotherms Some animals are better described as heterotherms Some heterotherms regulate T b over a wide range of T a Temperatures of honey bee thorax and abdomen
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