Wednesday, February 17, 2016
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Thursday, February 11, 2016
40.3- Thermoregulation
40.3-
Thermoregulation
·
Regulation of internal temperature
·
Endothermy- warmed by the heat of metabolism ,
internal heat source (humans)
o
Need more food
·
Ecothermy- warmed by environment, external heat source
(reptiles)
o
Need less food because food is scarce
o
Larger fluctuation in body temperature
o
Regulate body temperature by moving to shading
and basking
·
Variation in body temperature
o
Poikilotherms
§
Variation, body temp varies with environment
o
Homeotherms
§
Same, constant body temp
o
Never use warm-blooded or cold- blooded
·
Balancing heat Loss and Gain
o
Figure 40.11
o
Integumentary (Skin)
§
Insulation- fat, hair, feathers
§
Circulatory Adaptation- vasoconstrictions, vasodilation
§
Countercurrent Exchanges
§ Cooling by Evaporation
· Heat or Loss
§ Behavior Response
· Migration, Hibernation
§ Adjusting Metabolic Heat Production
·
Vary heat production to match changing rates of
heat lose
o
Shiver
§
Acclimatization in Thermoney
·
Shedding
·
Changes in Lipids
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