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11 Cards in this Set

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  • Back
-Endothermic vs. Ectothermic
-Homeothermic vs. Poikilothermic
constant body temp vs. variable body temp
-endotherm - organism who's body temp is influenced by it's own metabolic processes
-ectotherm - animal who's body temp is determined exclusively by energy acquired from its environment
thermal neutral zone
metabolic rate does not change -> "comfort zone". If above/below the thermal neutral zone, it's costly
Responses in the Thermal Neutral Zone
-Pilomotor changes (ex. hair raising)
-alteration of blood flow
-alteration of body position (decrease SA:volume)
Responses Below Lower Critical Temp
-nonshivering thermogenesis - brown fat - thermal tissue with lots of mitochondria
*all are ATP expensive
Responses above upper critical temp
-sweating -> costly b/c you have to pump ions out
-defecation on feet
differences between desert and artic foxes:
desert fox: large ears, thin hair
artic fow: small, furry eary, thick coat
Q10 effect
a range of 10 degress will cause a 2-3 fold increase in O2 consumption
what is behavioral thermoregulation?
limitations to certain body temps restricts ectotherms to a small range of metabolic rates.
what is an ectothemic exception?
Bluefin tuna -> homeotherm. how? countercurrent system of blood flow. no aorta so blood flows towards outside then flows into the muscle where it is trapped. advantage: they are predators and can swim faster when warm
How to find Central Temp Receptors?
insert thermodes and see what location causes a body temp change -> hypothalamus.
Peripheral Temperature Receptors
in skin. warns hypothalamus of impending temperature change.