Fight or Flight is a physiological/psychological response to a threat. During this automatic, involuntary response, an area of the brain stem will release increased quantity of NOREPINEPHRINE which in turn causes the ADRENAL glands to release more ADRENALINE. This increase in Adrenaline causes faster heart rate, pulse rate, respiration rate. There is also, shunting of the blood to more vital areas, and release of blood sugar, lactic acid and other chemicals, all of which is involved in getting the body ready for fighting the danger (a tiger, a mugger), or running away from the threat. Feelings of dread, fear, impending doom, are common.
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