Alveolar macrophages, SEM

Alveolar macrophages, SEM


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Alveolar macrophages. Coloured scanning electron micrograph (SEM) of alveolar macrophage white blood cells (yellow) in lung tissue. Macrophages are cells of the body's immune system that are found in the tissues rather than in the circulating blood. They recognise foreign particles, including bacteria, pollen and dust, and phagocytose (engulf) and digest them. Alveolar macrophages are associated with lung alveoli (air sacs) and epithelium (lining tissue). Magnification: x3,000 when printed at 10 centimetres wide.

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