Activated macrophage, SEM

Activated macrophage, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Activated macrophage. Coloured scanning electron micrograph (SEM) of an active macrophage white blood cell. 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. In the active state the cell surfaces have numerous cytoplasmic extensions (thread-like), which are used for locomotion within the tissues as the cell seeks out and engulfs the foreign particles.

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Keywords: activated, active, biological, biology, cell, cell biology, colored, coloured, cytological, cytology, cytoplasmic extension, defence, extensions, false-colored, false-coloured, grey background, immune system, immunity, immunological, immunology, leucocyte, leucocytes, leukocyte, leukocytes, locomotion, macrophage, monocyte, phagocyte, phagocytic, response, scanning electron micrograph, scanning electron microscope, sem, white blood cell

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