BIO120H1 Lecture Notes - Lecture 15: Countercurrent Exchange, Koala, Alpine Tundra
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BIO120H1 Full Course Notes
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Heat balance/ thermal ecology is an environment challenge to the physiology of animals! Slide 2: basic processes of heat exchange: radiation: heat transfer by electromagnetic radiation! The hotter you are, the more heat you are radiating: conduction: transfer by direct contact with substrate! Your feet are losing heat to the ground, because the ground is colder than your feet: convection: heat transfer mediated by moving uid! Through air or water usually, ex. wind chill: evaporation: ef cient cooling from wet surfaces! Heat is easier to be lost if the object is more moist: redistribution: circulatory system redistributes heat among body parts, esp. core to appendages! Ex. your lungs are losing lots of heat as cold air is breathed in, however your muscles are making lots of heat as they"re moving! Slide 3: size in heat balance: surface area is what"s radiating heat, volume traps heat (more volume = more heat), thermal inertia, surface area : volume ratio !
