Biol 216 4 Homeostasis 62-91.pdf

Biol 216 4 Homeostasis 62-91.pdf - b Range of optimal...

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5/17/17 1 a. Maximum running speed of a lizard at various body temperatures b. Range of optimal physiological performance Produces excellent performance Regulating body temperature within this range Maximum speed (m/s) (% of maximum) Performance Body temperature (°C) Body temperature (°C) 62 Heat Exchange Kinetic movement of molecules gives rise to conduction, convection, and evaporation. Electromagnetic radiation: transmitted as waves. 63
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5/17/17 2 Heat Exchange Conduction: Flow of heat between molecules in direct contact Convection: transfer of heat from a body to a substance (air, water) that passes over its surface Radiation: transfer of heat as electromagnetic radiation Evaporation: heat transfer through the energy required to change a liquid to a gas (sweat) 64 Ectotherms and Endotherms Ectothermic animals obtain heat energy primarily from the environment Endothermic animals obtain heat energy primarily from internal reactions 65
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5/17/17 3 Ectotherms Body temperature not determined by metabolic heat, but by environment. Regulate body temperature by controllingthe rate of heat exchange with the environment. Metabolic ratealso increases with environmental temperature Examples: invertebrates, fishes, amphibians, reptiles 66 Ectotherms May regulate body temperature by behavioral means May speed or slow changes in body temperature by physiological adjustments Can only reside in certainenvironments that are suitable for their body temperature needs . In nature 67
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5/17/17 4 Advantages to ectotherm Can be small, live in small places We do not find endotherms that are the size of most insects, for example.
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