Reflex actions are very useful in protecting the body from harm. If you had to think about what movements to make when suddenly threatened with harm, you might become confused and do the wrong thing. The automatic action of your reflexes usually causes you to act correctly and quickly enough to avoid or lessen the danger threatening you. For example, if you suddenly become aware of an object flying through the air towards your face, reflex actions causes you to dodge the object and to close your eyes tightly. You can do all thinking later!
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