Examlex
Which of the following was one of the most observable physical differences in physical anthropologists' early studies of human variation?
Pupil Diameter
The size of the opening in the center of the iris of the eye, which regulates the amount of light that enters the eye.
Sphincter Pupillae
Circular smooth muscle fibers of the iris’s diaphragm that constrict the pupil of the eye.
Ciliary Muscles
Ring-shaped muscles in the eye that change the shape of the lens to focus light on the retina, enabling the eye to adapt its vision for close or distant objects.
Dilator Pupillae
Radial smooth muscle cells of the iris diaphragm that cause the pupil of the eye to dilate.
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