CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY
Human eye. Macroscopic footage of part of the iris of a healthy human eye. The iris is a circular structure, and pigmented, giving the eye its colour. The iris is composed mostly of smooth muscle, and contracts and relaxes under involuntary control to regulate the size of the pupil which allows light into the eye.
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