50.8 MB (1.9 MB compressed)
4698 x 3780 pixels
39.9 x 32.0 cm ⏐ 15.7 x 12.6 in (300dpi)
CNRI / SCIENCE PHOTO LIBRARY PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY PHOTO LIBRARY
False-colour scanning electron micrograph (SEM) showing three macrophages located in an alveolus (air sac) of a human lung. Macrophages are relatively large, scavenger cells that serve to clear the lungs of dust, pollen, bacteria & some components of tobacco smoke through phagocytosis (engulfing). They are, however, vulnerable to some toxic pollutants & their destruction can give rise to pulmonary diseases. In cases of asbestosis & mesothelioma (a type of lung cancer) the macrophages are impaled & destroyed by needle- like asbsestos particles. Magnification: x2,000 at 6x7cm size, x1,000 at 35mm size.
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