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reacting when someone flashes his or her hand to your face that includes blinking

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A reflex action is a sudden reaction to a stimuli (a change in the environment) & often acts to protect you.


Some are controlled by the brain (cranial reflexes) such as when you blink as dust lands in your eye, or your pupil gets smaller as light is shone in your eye.


Some reflexes are controlled by the spinal cord (spinal reflexes) such as when you touch a hot object or stand on a pin.


Some reflexes can have learnt responses so they are calledconditioned reflexes. These reflexes occur without you even thinking about them e.g. walking & producing saliva when you smell food.

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