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8 Cards in this Set
- Front
- Back
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What is the difference between ectotherms and endotherms?
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Ectotherms=absorb external heat; more efficient
Endotherms=generate own heat through metabolic processes; they are less efficient at transforming energy because they lose it as heat. |
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What is some evidence that dinosaurs were endothermic? (hint: one organism)
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Mei long= dino preserved in sleeping pose, meaning they tuck head in to preserve heat.
Discovered in 2004. |
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What is behavioral thermoregulation?
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Cold blooded animals maintain their body temp by moving between hot and cold micro habitats. (ex lizard)
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What is physiological thermoregulation?
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If its too hot...increase blood flow to periphery; sweating, panting.
If its too cold...decrease blood flow to periphery; shiver. Ex: counter-current heat exchanger, human thermostat |
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What is physical thermoregulation?
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Insulation.
Darker colors. |
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What is a counter-current heat exchanger?
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In tunas and sharks.
Heat is generated by swim muscles and retained in muscles. Is an example of physiological thermoregulation. |
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What is a human thermostat?
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In hypothalamus.
Negative feedback system. Sweating and shivering. Is an example of physiological thermoregulation. |
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What are the costs of endothermy?
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Insulation: feathers, fur, fat layers.
Cooling systems: heat and water must be liberated (sweating, panting) Fuel: need food and oxygen |
