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Cilia are slender, microscopic, hair-like structures or organelles that extend from the surface of nearly all mammalian cells (multiple or single). They are primordial. The ciliary apparatus is connected to cell cycle progression and proliferation, and cilia play a vital part in human and animal development and in everyday life.
The iris is the colored part of the eye. This coloring is due to pigment cells in the tissue. People with blue eyes have less pigment in their iris than those who have brown eyes. The iris contains the sphincter pupillae, the muscle used to narrow the pupil, and the dilator pupillae, the muscle used to widen it.he lens is a clear structure behind the pupil that does just what a regular lens does. The main purpose of the lens is to focus light by changing shape. The ciliary body is a muscle group attached to the lens that help the lens change its shape to better focus light on the retina.