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Does Sympathetic Dilate Pupils—Does The Sympathetic Nervous System Dilate Pupils? | Pupil Dilation Explained

Yes, sympathetic nerve activity widens the pupil by contracting the iris dilator muscle through alpha-1 adrenergic receptors. If you’ve ever walked into a dark room and felt your eyes “open up,” you’ve watched your autonomic nerves in motion. Pupil size isn’t random. It shifts second by second to manage light, sharpen attention, and keep vision

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