Which eye feature may dilate to allow 100 times more light into the eye?

Study for the Bioenvironmental Engineering (BEE) Block 6 Exam. Utilize flashcards and multiple choice questions, with hints and explanations for each question. Prepare for your exam with confidence!

Multiple Choice

Which eye feature may dilate to allow 100 times more light into the eye?

Explanation:
The pupil is the opening in the eye that can vary in size. When it dilates, more light can enter, which is especially helpful in dim conditions. This widening is controlled by the iris muscles under autonomic control: the dilator muscles pull the pupil open in low light, while the sphincter muscles constrict it in bright light to reduce light entry. The retina, cornea, and lens don’t regulate how much light gets in; they handle sensing and focusing. So the feature that may dilate to allow much more light into the eye is the pupil.

The pupil is the opening in the eye that can vary in size. When it dilates, more light can enter, which is especially helpful in dim conditions. This widening is controlled by the iris muscles under autonomic control: the dilator muscles pull the pupil open in low light, while the sphincter muscles constrict it in bright light to reduce light entry. The retina, cornea, and lens don’t regulate how much light gets in; they handle sensing and focusing. So the feature that may dilate to allow much more light into the eye is the pupil.

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