Question

What part of your brain makes this "fight or flight' decision for you?

Answer 1

Hint: The body's fight-or-flight reaction is triggered by adrenaline. This reaction allows the airways to dilate, allowing the muscles to get the oxygen they need to fight or flee from danger. Adrenaline also causes blood vessels to constrict, redirecting blood away from large muscle groups including the heart and lungs.

Complete answer:
The amygdala makes this decision for you. The amygdala is responsible for the reaction to and memory of emotions, particularly fear. This "dread" is what triggers the flight or fight response. And this is the reason you fled from the guy who had tried to fight both of you weeks before. This is why you slapped your brother or sister when he needed to fight you. We would have no anxiety if the amygdala didn't exist. Researchers have used profound lesioning (a technique in which a flimsy wire is inserted into the cerebrum to remove or end a piece of the mind) to eliminate the amygdala of rodents in a number of studies.
The rodents were said to have no fear of anything after using this procedure, including felines. The evacuation of the amygdala had erased the rodents' fear memory; as a result, the rodents became fearless! What exactly is this "flight or war" thing?
There is a threat.
As a result, the autonomic sensory system alerts the body.
As a result, the adrenal cortex releases stress hormones.
As a result, the heart beats more rapidly and with greater vigour.
As a result, breathing becomes more rapid.
The thyroid gland is a normal stimulator of digestion.
As a result, larger muscles receive more oxygenated blood.
Are there any fake alerts?
Despite the fact that the fight or flight response is programmed, it is not always accurate. Indeed, when the battle or flight response is triggered, it is frequently a bogus caution, implying that there is no danger to endurance. The amygdala, the part of the brain that initiates the programmed part of the fight or flight response, is incapable of distinguishing between a genuine and a fake threat to endurance.

Note:
A series of nerve cell terminations occurs when our fight or flight response is triggered, and synthetic substances such as adrenaline, noradrenaline, and cortisol are released into our circulation system. These examples of nerve cell termination and synthetic delivery trigger a number of highly unpleasant changes in our bodies.