White blood cells

White blood cells

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Credit: DON FAWCETT/SCIENCE PHOTO LIBRARY

Caption: Immune system cells. Coloured Scanning Electron Micrograph (SEM) of a macrophage (blue) and two lymphocyte (yellow) cells of the human immune system. These cell types are both derived from white blood cells. The larger macrophage (or mono- cyte) often has an irregular shape. Macrophages engulf and digest foreign bodies; they wander across tissues to sites of infection and are the first immune response. Lymphocytes (T-cells or B- cells) are rounded and occur in the blood; they recognise foreign antigens and destroy invaders such as viruses and bacteria. Both cell types have thin projections on their surface called filopodia which are used for support and motility.

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Keywords: anatomy, cells, components of, cytology, defence, healthy, histology, human, human body, immune system, immunology, lymphocyte, macrophage, monocyte, normal, scanning electron micrograph, sem, white blood cell

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