BIOG 1440 Lecture Notes - Lecture 7: Brown Adipose Tissue, Heterothermy, Komodo Dragon
3 Mar 2018
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Objectives: why care about body heat, physics of heat exchange, ectotherms, endotherms. Smaller surface area to volume ratio--able to generate more heat metabolically: surface area--radiation, conduction, convection, evaporation, radiation. Larger surface area to volume ratio--able to lose more heat from surface: radiative heat can be gained or lost. Energy is lost as infrared electromagnetic waves: radiation depends on, difference in temp of two surfaces, color. Surface area of objects (emissivity of surfaces: conduction (can be gained or lost, conduction is the direct transfer of kinetic energy of molecular motion. Requires physical contact of object with either solid, liquid, or gas: depends on , diff in temperature of two surfaces. Ambient temp at which phase change takes place. Volume of water evaporated: humidity of ambient air, diminishing surface loss: the insulation strategy, animals may evolutionarily modify conductivity and/or distance to vital organs.
