The fear reaction
The fear reaction starts in the brain's amygdala region and spreads through the body to prepare the body for the best defense or flight reaction. Fear also triggers the release of stress hormones and the sympathetic nervous system.
During a dangerous situation, the brain becomes hyperalert, pupils dilate, the bronchi dilate, breathing accelerates, heart rate and blood pressure rise, blood flow and a stream of glucose to the skeletal muscles increase, and organs not vital in survival slow down, such as the gastrointestinal system.
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