![]() All of these physical responses are intended to help you survive a dangerous situation by preparing you to either run for your life or fight for your life (thus the term "fight or flight"). trouble focusing on small tasks (brain is directed to focus only on big picture in order to determine where threat is coming from).nonessential systems (like digestion and immune system) shut down to allow more energy for emergency functions.smooth muscle relaxes in order to allow more oxygen into the lungs.muscles tense up, energized by adrenaline and glucose (responsible for goose bumps - when tiny muscles attached to each hair on surface of skin tense up, the hairs are forced upright, pulling skin with them).veins in skin constrict to send more blood to major muscle groups (responsible for the "chill" sometimes associated with fear - less blood in the skin to keep it warm). ![]() pupils dilate to take in as much light as possible.
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