The amygdala sends a danger signal to the hypothalamus, the part of your brain that regulates many key bodily functions like body temperature and heart rate. This stress response starts in the brain in your amygdala, a part of the brain involved with emotions such as fear. It all starts with your amygdala and stress response, commonly called fight, flight, or freeze responses - a reaction to an acute, or short-term, stressor.įor example, losing control of your car on an icy road or having a sudden confrontation with an angry family member can both cause your stress response to be activated in any of the three ways. Stress can have both short- and long-term effects on the brain.
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