J. L. CARSON, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY J. L. CARSON, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Tracheal epithelium. Coloured transmission electron micrograph (TEM) of a section through a ferret's tracheal (windpipe) epithelium. Two epithelial cells are seen in interphase, the stage between mitosis (cell division). Their nuclei (black, round) contain chromatin genetic material (blue) and they have cilia (tiny projections) on their upper surface (at top). Other cells of the trachea produce mucus which traps airborne bacteria, pollen and dust. Rhythmic movements of the cilia moves the mucus up the trachea and away from the lungs. Magnification unknown.
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