the size of the pupil is regulated by the action of iris muscle name the muscle
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Explanation:
iris dilator muscle (pupil dilator muscle, pupillary dilator, radial muscle of iris, radiating fibers), is a smooth muscle of the eye, running radially in the iris and therefore fit as a dilator. The pupillary dilator consists of a spokelike arrangement of modified contractile cells called myoepithelial cells.
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These are
Ciliary muscles.
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