BIOL 205 Lecture Notes - Lecture 30: Electrical Resistivity And Conductivity, Vasodilation, Vasoconstriction
7 Sep 2016
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Based on source of heat, ectotherm, obtain heat from environment, endotherms, produce heat internally. During heat loss heat moves from deep parts to skin: body wall thickness, conductance, temperature gradient, determine speed of loss or gain. 4. contact surface area must be normal to direction of heat flow. Intensity increases with: temperature, frequency, against wavelength. 5: evaporation, only for lowering body temperature in hot environment, evaporation of water needs a lot of energy, thus, it cools a lot, sweat, panting, drooling on the body surface. Heat exchange between organism and the environment: total heat = heat produced metabolically + heat gained or lost, depends on mass and overall specific heat or tissues, an organism can gain or lose heat depending on gradient. Heat exchange in cold environments: core body temperature of endothermic animals, range of 30c to 42c birds are higher, thermal neutral zone (tnz, specific range in which temperature is kept constant.
