Pupil and iris

Pupil and iris

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Caption: colour enhanced electron micrograph of the eye, showing the pupil and iris. Epithelial frill surrounds the pupil, the opening of the iris. Iris muscles (dilator and sphincter) cause the pupil to dilate and constrict, regulating the amount of light that enters the eye. x40. Enhancement of 5p7377.

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Keywords: anatomy, body, electron micrographs, epithelial frill, eye, eyes, human, images, iris, irises, magnified image, micrograph, micrographs, micrography, microscopic photos, pupil, pupils, sense, sight, subjects, vision, visual

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