| A | B |
|---|
| Maintenance of a constant internal environment | homeostasis |
| Maintenance of a constant core temperature | homeothermy |
| Animals that rely on an external heat source for the maintaining body temperature | ectotherms |
| animals that can remain active in cold external conditions | endotherms |
| This group of animals are endotherms | birds |
| This group of are inactive when the external temperature decreases | lizards |
| Body parts that are effectors | muscles and glands |
| internal thermoreceptors | hypothalamus |
| a way by which blood flow to the skin can be increased | vasodilation |
| A way by which hair can be trapped on the skin surface to keep in body heat | piloerection |
| glands whose activity influences the rate of metabolism | adrenal and thyroid |
| When peripheral blood vessels contract to reduce blood flow to the skin | vasoconstriction |
| Something that must happen to sweat before there is cooling | evaporation |
| Transfer of heat between two objects that are in contact | conduction |
| Method of heat transfer from the Sun to the body of an organism | radiation |
| Body systems that act as messengers | nervous and hormonal systems |
| When the response controls the stimulus bringing conditions back to normal | negative feedback |
| Situation where the body is not in control | positive feedback |
| A change which the body's receptors can detect | stimulus |
| Body parts that respond to stimuli | effectors |
