Macrophage cell in lung, SEM

Macrophage cell in lung, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Macrophage in lung. Coloured scanning electron micrograph (SEM) of a macrophage cell (round) in an alveolus. Alveoli are the tiny air sacs that are the site of gaseous exchange in the lungs. Macrophages are a type of large white blood cell that are found in tissues rather than circulating in the blood. They recognise foreign particles, including bacteria, pollen and dust, and phagocytose (engulf) and digest them. Magnification: x1000 when printed 10 centimetres wide.

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Keywords: air sac, air space, alveolus, anatomy, biological, biology, cells, coloured, defence, false-colour, false-coloured, histological, histology, human body, images, immune, immune cell, immunity, immunological, immunology, lung, macrophage, magnified image, microscopic photos, one, phagocyte, phagocytic, physiological, physiology, response, scanning electron micrograph, scanning electron microscope, sem, single, subjects, system, wbc, white blood cell

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