Lecture 14: Thermoregulation Flashcards
Homotherm
animal whose central temp is independent of wide range of ambient temps, enotherm, control body temp through internal means
Poikiloterm
animal whose central body temp differs little from ambient temp, ectoderm; exchange heat with surroundings through activitues
Homeothermy
mode of thermoregulation where animal maintains relatively stable internal temprature, meyabolic recations oerate at optimal temps
hypothermy
below normal core temo
hyperthermy
above normal core temp
Thermoneutral zone
core body temp and metabolic rate constant; comfort zone
Energy budget equation
Energy production-heat loss = heat stored
Radiation
flow of energy bewteen objects in space that depends on absolute temp and nature of radiating surfaces
conduction
flow of heat from one object to another with which it is in contact
convection
transfer of heat dependent upon a liquid or gas medium
Insensible heat transfer
increases as ambient temp increases after a certain point
Evaporative heat exchange
removal of heat from surface of a liquid that is osig some of its molocules as gas; less effective in humid air
2 main sources of evaporative heat loss
skin and respiratory tract
Panting
water and associated heat loss through respiratory syetm increases; increase ventilation of dead space and increases removal of respiratory water vapor thus increaseing heat loss
Adjusting rate of heat exchange
- insulation
- vasodilation
- metabolic heat production
- behavoral chnages
- countercurrent exchange
- heat storage
- fever
