BIOL 125 Lecture Notes - Lecture 8: Torpor, Extracellular Fluid, Positive Feedback
1 Feb 2017
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Effect on metabolic reactions (q10 effect: factor by which metabolic reactions due to an increase of temperature by 10 c) Conduction: heat exchange because physical contact between 2 things; works both ways: can be warmed up or absorb. Convection: acceleration of heat of exchange because of the movement of fluids (liquid and gases) (ex. fan in convection ovens or heat index); can happen both ways. Radiation: heat exchange without physical contact, movement of energy i electromagnetic waves (ex. sun); happens both ways: can radiate or absorb heat. Evaporation (ex. sweating, panting, gaping): breaks h2 bonds on h2o; cools our bodies b/c of properties of h2o (polarity, state); happens only one way **surface areas-volume ratio** Behavioral control of temperature: movement between shade and sun to maintain an optimal temperature, body orientation. Physiological control of temperature: localized vasodilation: capillaries expand (greater surface area), maximizes heat absorption (24:21, color change (darker shades absorb heat faster while lighter shades reflect heat)
