The purpose of fear, clearly, is to help you get away - which it does. If your heart rate increases, there is more blood pumping so you can use that blood to fuel your muscles to run away. Oxygen is sent to the lungs so you can run fast. Pupils dilating help you see in the dark. All of that prepares your body to fight or escape. (Sy Montgomery)

The purpose of fear, clearly, is to help you get away - which it does. If your heart rate increases, there is more blood pumping so you can use that blood to fuel your muscles to run away. Oxygen is sent to the lungs so you can run fast. Pupils dilating help you see in the dark. All of that prepares your body to fight or escape.

Sy Montgomery

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blood body dark escape fast fear fight fuel heart help oxygen pumping purpose rate run see sent use

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