Or fight-or-flight is a psychological reaction that occurs as a response to the harmful or stressful event.
Response of the sympathetic nervous system to a stressful situation, prepares the body to literally flee or fight, and it's associated with the secretion of adrenal and epinephrine and it is characterized by abnormal increase in heart beating, blood flow to the muscles and brain, sugar levels are also higher than usual, palms become sweaty, pupils dilated and hair gets upright. As a result we have major alertness and sharpness.
