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Published byLucinda Williams Modified over 8 years ago
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Thermoregulation: temperature balance Hannah Nevins Bio 1b: Zoology Spring 2009
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Thermal Strategies: Ectotherms ◦ Heat generated from outside ◦ Rely on external sources (e.g. solar radiation) ◦ e.g. reptiles Endotherms ◦ Heat generated from “within” ◦ Rely on metabolic heat production ◦ e.g. Mammals, birds
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Adaptations: Anatomical insulation - fur, feathers, blubber heat radiators – big ears Physiological circulation counter-current Behavioral huddling bathing
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Whale Blubber: fat & connective tissue
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Behavioral mechanisms to loss heat: panting, seeking shade
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Counter-current Heat Exchange:
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Integument: role in thermoregulation
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Frostbite: tissue damage from cold
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Hypothalamus: thermostat
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Antarctic Ice Fish Antifreeze blood – glycoproteins Lack RBCs and hemoglobin (vestigial DNA coding for Hb, Mb)
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