Temperature Regulation Flashcards
Meaning of ectothermic animals
Body heat determined by external sources
Meaning of endothermic animals
Body heat determined and produced by the body’s own production of heat
Meaning of poikilothermic
Body temp changes with ambient temp
Meaning of homeostatic
Body temp maintained within narrow limits even though ambient temp varies
What are the methods of reducing heat loss
Waterproofing
Insulation
Blubber
Methods of heat gain
Increased muscle activity - shivering
Thyroid hormone release - adrenaline
Brown adipose tissue - heat production
Method of heat loss
Sweating
Panting
What controls vasodilation
Sympathetic NS
What is the principal of vasodilation
Divert blood flow towards/away from the surface of skin to dissipate heat
What are the two types of perspiration/panting and define them
Sensible - constant loss of vapour from surface
Insensible - observable, when exercise etc
What does sweating do
Maintain constant body temp and excrete waste substances like urea, ammonia etc
What are the specialised glands that birds have
Preening/uropygial glands
How do ectotherms lose/gain heat, give examples
By behaviour: bask, absorb rock heat, huddling, beating wings
Definition of thermoregulation
Control of heat to maintain a constant deep body temp
Name the area in hypothalamus that’s important for temp regulation
Preoptic area
