The _____ is a colored circular muscle that expands and contracts and, thus, changes the size of the pupil.
A)cornea
B)iris
C)retina
D)lens

Question

Quizplus · Accepted Answer

The iris is the colored circular muscle in the eye that controls the size of the pupil, which can expand or contract to regulate the amount of light entering the eye. The cornea is the clear, outermost layer of the eye. The retina is the light-sensitive layer located at the back of the eye. The lens is a transparent structure behind the iris that helps to focus light onto the retina.

The _____ Is a Colored Circular Muscle That Expands and Contracts