Theme 29 - Temp met 2 Flashcards
What are the three metabolic processes that product heat?
Energy metabolism – digestion – muscle activity
can both endo and ectotherms produce metabolic heat?
yes but only endotherms can retain enough heat to elevate body temp above ambient
what do ectotherms ave since they cant retain enough heat?
futile cycles to warm themselves (ex. vibrating wings of a bee)
What two things does endothermy require to regulate body temperature?
- Metabolic rate (thermogenesis) – heat exchange with the environment
what are 5 advantages of high constant body temperature?
growth development digestion biosynthesis muscle contraction
Do endo or ectotherms produce more metabolic heat?
endotherms produce more metabolic heat
What unit is used to measure amount of heat energy?
kcal or Calories
what is Basal metabolic rate?
rate of heat production in an endotherm in thermoneutral zone
what is standard metabolic rate?
rate of metabolism in ectotherms
what is metabolic energy required for?
regulating heat gain and loss
how can metabolism be measured?
heat production
oxygen utilization
is mass specific BMR larger or smaller for small animals and why?
larger for small animals because heat loss is through body surface area
why is thermoregulation necessary?
because ambient temperature varies
what is the central controller of thermoregulation?
hypothalamus
what are the 7 mechanisms of thermoregulation?
peripheral vasomotor responses shivering panting sweating piloerection (shunt pathway) generation of heat by BAT (brown adipose tissue)
