These projections on the luminal surface of epithelial cells are motile processes that move secretions and other substances across the surface of the cell. They are composed of nine pairs of microtubules arranged circumferentially around a central pair of microtubules. Each cilium is attached to a basal granule that has a structure similar to that of a centriole. Ciliary movement is produced by molecular motor mechanisms that cause the microtubules to slide relative to each other.
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