Unformatted text preview: y heat critical organs)
and insects that only heat critical organs) Endothermic Thermoregulation
Endothermic Thermoregulation Thermal Neutral Zone - Range of temps over which
metabolic rate of homeothermic animal doesn’t change Metabolic Rate What causes increase in MR at low temps?
What causes increase in MR at low temps?
High temps? Lower Lower Upper Upper Lethal Critical Critical Lethal Ambient Temp Low Temps Humans – shivering – heat through muscle contraction
Release hormones – increase metabolic rate (rate at which
hormones increase metabolic rate (rate at which
metabolize energy stores) – increases generation of heat. High Temps – heart rate and blood flow to the skin increases –
transports heat from the body to skin increases convective heat loss,
heat from the body to skin increases convective heat loss
Evaporative cooling accelerates heat loss (large endotherms -horses,
humans, camels sweat, Dogs birds pant, marsupials, rodents
humans, camels sweat, Dogs birds - pant, marsupials, rodents...
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