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THERMOREGULATION (Keeping body warm in the cold (Shivering,…
THERMOREGULATION
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definition
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Ectotherm
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Almost all animals (many fish, most invertebrate, amphibians; except birds and mammals.)
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Survival in the heat
Vasodilation ; blood vessels dilate, increases blood flow, heat loss through evaporative cooling
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Panting (birds, dogs, sheeps, goats)
Small animal, large body surface area
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Temperature Coefficient, Q10
The rates of biochemical reactions and physiological processes due to the changes of body temperature.
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Relationship between endothermic , ectothermic, homeothermic and poikilothermic
Endothermic + Homeothermic : Mostly birds and mammals , tuna and some other large fish
Ectothermic + Homeothermic : Some tropical reptiles , dinosaurs (possible) and organisms occuring deep in the ocean / deep lake
Endothermic + Poikilothermic : Birds and mammals ( that can regulate body temp. with time period) , insects and invertebrates
Ectothermic + Poikilothermic : Most fish, amphibians, reptiles and most invetebrates
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Transfer of heat (Tb)
Convection,
takes place in fluid phase and involve mass movement of fluid , as a result of change in density or forces by external factors
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Conduction
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Metals are good conductors of heat , animal fur and feathers are very poor conductors (good insulators)
Radiation
Transfer of heat between objects that are not in direct contact. Heat is transferred as electromagnetic waves.
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evaporation
When water becomes vapour, it takes heat from surface it is contact with
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