Insects that only heat critical organs endothermic

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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