The iris of the eye is:

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(A) The iris is the visible colored part of the eye. It contains smooth muscles that control the diameter and size of the pupil,thereby regulating the

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$A$ structure that controls the size of the pupil

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(A) The iris is the visible colored part of the eye. It contains smooth muscles that control the diameter and size of the pupil,thereby regulating the amount of light that enters the eye. It is not a receptor (chemoreceptor or calororeceptor). Therefore,the only functionally correct description among the choices provided is that it controls the size of the pupil.

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