Which colored portion of the eye controls light entry by adjusting the size of the pupil?

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Multiple Choice

Which colored portion of the eye controls light entry by adjusting the size of the pupil?

Explanation:
The iris. It’s the colored ring around the pupil, and it controls light entry by changing the pupil size. When light is bright, the circular muscles of the iris contract to make the pupil smaller, reducing light entering the eye. In dim light, the radial muscles pull the pupil open wider, letting more light in. This adjustment is an automatic response managed by the autonomic nervous system. The cornea is the clear front surface that helps focus light, the retina is the light-detecting layer at the back, and the conjunctiva is the protective membrane covering the white of the eye — none of these adjust pupil size.

The iris. It’s the colored ring around the pupil, and it controls light entry by changing the pupil size. When light is bright, the circular muscles of the iris contract to make the pupil smaller, reducing light entering the eye. In dim light, the radial muscles pull the pupil open wider, letting more light in. This adjustment is an automatic response managed by the autonomic nervous system. The cornea is the clear front surface that helps focus light, the retina is the light-detecting layer at the back, and the conjunctiva is the protective membrane covering the white of the eye — none of these adjust pupil size.

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