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Thermoregulation: temperature balance

Thermoregulation: temperature balance. Hannah Nevins Bio 1b: Zoology Spring 2009. 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

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Thermoregulation: temperature balance

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  1. Thermoregulation: temperature balance Hannah Nevins Bio 1b: Zoology Spring 2009

  2. 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

  3. Adaptations: • Anatomical • insulation - fur, feathers, blubber • heat radiators – big ears • Physiological • circulation • counter-current • Behavioral • huddling • bathing

  4. Whale Blubber: fat & connective tissue

  5. Behavioral mechanisms to loss heat: panting, seeking shade

  6. Counter-current Heat Exchange:

  7. Integument: role in thermoregulation

  8. Frostbite: tissue damage from cold

  9. Hypothalamus: thermostat

  10. Antarctic Ice Fish • Antifreeze blood – glycoproteins • Lack RBCs and hemoglobin (vestigial DNA coding for Hb, Mb)

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