| A | B |
|---|
| The maintenance of a constant internal environment within narrow limits | homeostasis |
| The maintenance of a constant body temperature | homeothermy |
| The optimum body temperature | 37ºC |
| When blood vessels close to the skin expand | vasodilation |
| Goose bumps | piloerection |
| When blood vessels close to the skin contract | vasoconstriction |
| Rapid contraction and relaxation of skeletal muscles | shivering |
| A hormone that increases metabolism | adrenalin |
| Group of animals that can independently maintain a constant body temperature | endotherms |
| Group of animals that rely on external temperature to maintain body temperature | ectotherms |
| This happens to sweat and cools the body | evaporation |
