NIBSC / SCIENCE PHOTO LIBRARY NIBSC / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph (SEM) of a macrophage cell moving over a surface. Wandering macrophages are monocytes from circulating blood that defend the body against invasion by foreign organisms. Macrophages migrate to tissues, notably to the lymphatic system and lungs; certain types of macrophage migrate to sites of infection. In an active state, as here, the cell spreads out using its frilly cytoplasm as arms to draw itself along the substrate to seek and engulf particles. In addition to a scavenging role, macrophages can detect antigenic (foreign) substances during the initial stage of the body's immune response. Magnification: x1375 at 6x4.5cm size.
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