The size of the pupil is controlled by the

1.	The size of the pupil is controlled by the
Answer» Iris The SIZE of the pupil is controlled by the activities of two muscles: the circumferential sphincter muscle found in the MARGIN of the iris, innervated by the PARASYMPATHETIC nervous system: and the iris DILATOR muscle, running radially from the iris ROOT to the peripheral border of the sphincter.

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Iris

The SIZE of the pupil is controlled by the activities of two muscles: the circumferential sphincter muscle found in the MARGIN of the iris, innervated by the PARASYMPATHETIC nervous system: and the iris DILATOR muscle, running radially from the iris ROOT to the peripheral border of the sphincter.

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The size of the pupil is controlled by the

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