It is the reaction of certain parts of our nervous system to perceived danger or stressful or frightening events. The body responds to these perceived threats by preparing it to react to the threats. The body does this by rapidly releasing certain substances called adrenaline and noradrenaline. These substances cause an increase in heart rate, blood pressure, and breathing rate. In such a state the body is prepared to run away from a threat or to fight the threat when fleeing is not possible.
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