Homeostasis (HSC SSCE Biology): Flashcards
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Endotherms
Endotherms
Organisms maintaining constant body temp via internal heat
Endotherms vs ectotherms heat source
Endotherms vs ectotherms heat source
Endotherms: internal metabolism; Ectotherms: external sources
Three types of adaptations
Three types of adaptations
Behavioural, structural, physiological
Thermoregulation
Thermoregulation
Control of body temperature
How insulation reduces heat loss
How insulation reduces heat loss
Traps air layer close to skin
SA:V ratio in cold environments
SA:V ratio in cold environments
Small SA:V - less surface area for heat loss
SA:V ratio in hot environments
SA:V ratio in hot environments
Large SA:V - more surface area for heat loss
Evaporative cooling mechanism
Evaporative cooling mechanism
Water evaporation removes heat energy from body
Vasodilation
Vasodilation
Blood vessels widen, increasing blood flow to skin for heat loss
Countercurrent exchange function
Countercurrent exchange function
Heat transfer from arterial to venous blood, reducing heat loss