According to the General Adaptation Syndrome, the response is the body's physiological arousal response stemming from a real or perceived threat.

Fight or Flight response

Explanation:

General Adaptation Syndrome or GAS is the three stage process.General Adaptation Syndrome or GAS is the physiological changes that the body goes through when it is in Stress.The theory of GAS is given by Hans Selye.Hans Selye observed in the rats, the physiological changes when they are exposed to stressful events.These changes are the typical response to stress.The three stages of General Adaptation Syndrome are as follows:

        1.  Alarm reaction stage.

        2. Resistance stage.

       3. Exhaustion stage