The part of the eye that controls the size of the pupil is the Blank______.Multiple choice question.sclerairischoroidciliary body

Understanding the Question

The question asks about the specific part of the eye that is responsible for controlling the size of the pupil. In this context, understanding the function of each of the provided options is essential.

1. Sclera: This is the white outer coating of the eyeball and mainly provides structure; it does not control the pupil size.
2. Iris: This part of the eye is responsible for regulating the diameter of the pupil and therefore controls the amount of light entering the eye. However, it was not one of the multiple choice options presented.
3. Choroid: This layer contains blood vessels and provides nutrients to the retina; it does not control the pupil size.
4. Ciliary Body: This structure is involved in adjusting the lens for focusing and secreting aqueous humor, but it does not directly control the size of the pupil.

Conclusion

Given the options provided, the best answer to fill the blank would be:

Ciliary body - although it doesn't directly control the pupil size, it's the operational choice among the options, while the Iris would be the correct term for its function.