BIOL10004 Lecture Notes - Lecture 16: Human Body Temperature, Poikilotherm, Thermoregulation

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BIOL Lecture 16
Thermoregulation
Why thermoregulate?
Biochemical reactions are temperature-sensitive
o Body temp too low metabolism slows, bodily functions disrupted
o Body temp too high enzyme function destroyed, proteins denature
Optimum body temperature varies among groups
o -2˚C – polar fish
o 0˚C – animals at thermal vents
o between 0-3˚C for ost aials
human body temperature
normal: 36.5-37.5˚C
What determines body temperature?
Metabolism- biggest contributor
metabolism generates heat
an increase in body temperature increases metabolic rate
heat exchange
conduction diret otat etwee aials ody ad aother surfae
convection cooler air/water movement removes heat from body surface
evaporation cooling occurs when water (e.g. from sweat) evaporates
radiation thermal (infrared) radiation from sun to animal, or form animal to
surroundings
old-looded s. arm-looded INACCURATE
other terms:
o poikilothermic body temp varies, fluctuates with environmental temp
o homeothermic constant body temp, regulated independently of
environment
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