Thermoregulation Flashcards
What are the two broad categories for responses to a thermal environment ?
Temp conformer -Poikilothermic (varied heat) (ectotherms)
Temp regulator - homeothermic (similar heat)
What are the 4 types of environmental heat exchange?
Conduction
Convection
Evaportation
Radiation
Conduction
Trasnfer of heat b/w obkects that are in direct contact with one another
Convection
The transfer of heat energy by air currents
Evaporation
Heat energy is expended to evaporate any fluid
Radiatipn
Transfer of heat energy by electromagnetic waves (heat waves)
Where does thermoregulation occur in the body?
hypothalamus
Where are thermorecpetors?
skin, hypothalamus, spinal cord
What are the autonomic controlling elements
Brown adipose tissue (non shivering thermogenesis)
Vasomotor system (thermal insulation)
Sweat glands (sweat)
Somatomotor controlling elements
Skeletal musculature (shivering thermogenesis)
Voluntary movement (behavioural thermogenesis)
The function of brown adipose tissue is to transfer energy from ___ into ___
food, heat
Thermal insulation - Vasomotor system
amount of blood flowing through the skin
Vasodilation/constriction
5 basic thermoregulatory states
normothermia (homeostasis)
Forced Hypothermia (dh)
Regulated Hypothermia (rheostasis)
Forced Hyperthermia (dh)
Regulated Hyperthermia (rheo)
Normothermia. Behavioural response? Autonomic?
Behavioural- move to desired ambient temp
Auto - low M,E,P
high skin blood flow
Forced hypothermia
B: Move warmer
A: metabolism is high
blood flow is low
piloerection is high
sweat is low
