fight or flight response. what is the mechanism?

Answers:
When we perceive an immediate danger, our brain processes incoming signal and sends a message to the whole body to mobilize resources for defense ("fight") or retreat ("flight"). The major recipient of these brain signals are adrenal glands, which secrete hormone epinephrine (adrenalin). Adrenalin is released into blood stream, binds to its receptors on various cells and initiates a "launch" sequence: it makes liver to release glucose into blood, it elevates heart rate and increases blood pressure, diverts blood flow from at the moment non-essential organs (like digestive tract) to muscles etc. It happens in the matter of seconds, so the individual becomes ready to face or evade the incoming danger.

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Adrenalin resppones it is a response wchic is genitcally tarnsmitted to us to protect ourselves from adversaries.

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