MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Macrophage. Coloured Scanning Electron Micrograph (SEM) of a macrophage, part of the body's immune response system. This is a solitary type of cell which engulfs and devours (by a process known as phagocytosis) invading microorganisms throughout the body. The projections on the cell's surface help the macrophage to fasten onto its prey. Macrophages are a type of white blood cell which are found outside the bloodstream, mainly in connective tissue. If an infection occurs, by bacteria entering a wound for example, macrophages migrate to the site of infection and "eat" the bacteria. Magnification: x4,500 at 6x7cm size.
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