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

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

7. Whale Blubber: fat & connective tissue

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

10. Counter-current Heat Exchange:

11. Integument: role in thermoregulation

13. Frostbite: tissue damage from cold

14. Hypothalamus: thermostat

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