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Pupil Reflex Involuntary Response Originates Brainsteam Resizing Iris

The pupil reflex is an involuntary response originating in the brainstem that regulates light entering the eye by adjusting the iris.

The pupil reflex is an involuntary response originating in the brainstem that regulates light entering the eye by adjusting the iris.

Front the pupil reflex
Back involuntary response, originates at brainsteam, resizing of iris to regulate light reaching retina, contraction of circular/radial muscles 

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