When fear strikes your body, you react almost instantaneously. What happens is first, the amygdala activates right before you consciously process the problem and begins the fight-or0flight response. The hippocampus and frontal cortex then kick in which are the rational center of our brain and help analyze whether the input is a true danger. The cardiovascular system increases the breathing rate and heartbeat while dilating and allows more oxygen to reach your muscles. The signals then reach the endocrine glands where a surge of adrenaline and cortisol are the result. The endocrine signals push glucose and other molecules out of reserve and into the blood which rushes into the muscles and you respond with a fight or flight.
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