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11 Cards in this Set
- Front
- Back
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-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 |
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thermal neutral zone
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metabolic rate does not change -> "comfort zone". If above/below the thermal neutral zone, it's costly
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Responses in the Thermal Neutral Zone
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-Pilomotor changes (ex. hair raising)
-alteration of blood flow -alteration of body position (decrease SA:volume) |
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Responses Below Lower Critical Temp
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-shivering
-nonshivering thermogenesis - brown fat - thermal tissue with lots of mitochondria -exercise *all are ATP expensive |
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Responses above upper critical temp
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-sweating -> costly b/c you have to pump ions out
-licking -panting -defecation on feet |
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differences between desert and artic foxes:
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desert fox: large ears, thin hair
artic fow: small, furry eary, thick coat |
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Q10 effect
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a range of 10 degress will cause a 2-3 fold increase in O2 consumption
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what is behavioral thermoregulation?
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limitations to certain body temps restricts ectotherms to a small range of metabolic rates.
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what is an ectothemic exception?
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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
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How to find Central Temp Receptors?
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insert thermodes and see what location causes a body temp change -> hypothalamus.
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Peripheral Temperature Receptors
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in skin. warns hypothalamus of impending temperature change.
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