Which part of the eye is the colored portion that constricts and dilates to regulate light entry?

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Multiple Choice

Which part of the eye is the colored portion that constricts and dilates to regulate light entry?

Explanation:
The iris is the colored ring around the pupil that controls light entry by adjusting the size of the pupil. It contains two smooth muscle groups: the sphincter pupillae constricts the pupil in bright light, reducing light entry, while the dilator pupillae dilates the pupil in dim light, allowing more light in. The pupil itself is the central opening that changes size, the retina is the light-detecting layer inside the eye, and the sclera is the tough white outer layer. So the colored portion responsible for constricting and dilating is the iris.

The iris is the colored ring around the pupil that controls light entry by adjusting the size of the pupil. It contains two smooth muscle groups: the sphincter pupillae constricts the pupil in bright light, reducing light entry, while the dilator pupillae dilates the pupil in dim light, allowing more light in. The pupil itself is the central opening that changes size, the retina is the light-detecting layer inside the eye, and the sclera is the tough white outer layer. So the colored portion responsible for constricting and dilating is the iris.

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