Biol 216 4 Homeostasis 92-111.pdf

Biol 216 4 Homeostasis 92-111.pdf - Torpor Sleeplike state...

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5/17/17 1 Torpor Sleeplike state produced when an animal has lowered its temperature set point. Greatlyreduces the energy required to maintainbody temperature Accompanied by reduction in metabolic, nervous and physical activity. 92 Daily Torpor Period of inactivity aligned with variationsin daily temperature Cycle of Daily Torpor 93
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5/17/17 2 Torpor Hibernation: extended torpor duringwinter Hibernators store large quantities of fats Temperature drop varies by animal: Woodchucks, squirrels: Tempmay drop20 Bears: coretemp drops a few degrees Estivation: seasonal torpor duringsummer Ground squirrels, toads frogs burrow when environmental temperatures are highand water is scarce. 94 Temperature Regulation Internal heat production is controlled by negative feedback pathways Triggeredby thermoreceptors Integratedby hypothalamus When temperature deviates from set point Signals from receptors trigger responses Changes inblood flow to the body surface, sweating or panting, behavioral modifications 95
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