The size of the pupil is controlled by the

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(D) The pupil is the central aperture of the iris. Its size is regulated by the contraction of radial muscles (which dilate the pupil) and circular mu

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Iris muscles

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(D) The pupil is the central aperture of the iris. Its size is regulated by the contraction of radial muscles (which dilate the pupil) and circular muscles (which constrict the pupil) of the iris in response to dim and bright light,respectively.Both of these muscle types are controlled by the autonomic nervous system.

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