BIO1022 Lecture Notes - Lecture 11: Vasodilation, Heterothermy, Evaporation

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Lecture 10 (27/8): Body Temperature
Endotherms
More energy expended above and below
Lower and higher critical temperature bound range
Metabolic rate increases to lethal limit
Greater environmental range
High and stable body temperature
High metabolic rate
Energetically very costly
Ectotherms
Adjust behaviour and activity to temperature
Often more tolerant of extremes
Reduced expenditure on thermoregulation
Doesn't require much foods
Limited duration of high activity
Reliance on environmental heat sources
Temporal heterothermy: over time
Regional heterothermy: throughout body
Thermoregulation:
Physiological and behavioural changes
Primarily through four general adjustments
Rate of heat exchange
Evaporate heat loss
Behaviour
Metabolic heat production
Thermoregulation by evaporative heat loss
Only works when air not saturated
Evaporation of sweat or other liquid
Panting by dogs and birds
Salivation and licking
Vasodilation important
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