Syndrome discovered by Selye. Consists of three stages,

1) alarm stage - CNS is aroused and body defenses are mobilized

2) stage of resistance/adaptation - mobilization contributes to flight or fight

3) stage of exhaustion - continuous stress causes the breakdown of compensatory mechanisms and homeostasis, marks the onset of diseases of adaptation

One of the catecholamines associated with GAS.

Decreases glucose uptake in the muscles and other organs and decreases insulin release from the pancreas resulting in hyperglycemia (preparing the body to take physical action: fight or flee). Chronic elevation is immunosuppressive.