Thermoregulation: temperature balance
-
Upload
duncan-brewer -
Category
Documents
-
view
100 -
download
10
description
Transcript of Thermoregulation: temperature balance
Thermoregulation: Thermoregulation: temperature balancetemperature balance
Hannah NevinsBio 1b: ZoologySpring 2009
Thermal Strategies: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
Adaptations:• Anatomical
• insulation - fur, feathers, blubber• heat radiators – big ears
• Physiological• circulation• counter-current
• Behavioral• huddling• bathing
Whale Blubber: fat & Whale Blubber: fat & connective tissueconnective tissue
Behavioral mechanisms to loss heat: panting, seeking shade
Counter-current Heat Counter-current Heat Exchange:Exchange:
Integument: role in Integument: role in thermoregulationthermoregulation
Frostbite: tissue damage Frostbite: tissue damage from coldfrom cold
HypothalamHypothalamus: us: thermostatthermostat
Antarctic Ice FishAntarctic Ice Fish
• Antifreeze blood – glycoproteins• Lack RBCs and hemoglobin (vestigial DNA coding for Hb, Mb)