White blood cell, SEM

White blood cell, SEM

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Caption: White blood cell. Coloured scanning electron micrograph (SEM) of a lymphocyte cell, a type of white blood cell and part of the immune system. Lymphocytes are divided into either B-cells or T- cells. B-cells mature in bone marrow and are responsible for humoural immunity; they operate by recognising a specific site on the surface of a pathogen or foreign object (antigen), which they then bind to before producing antibodies to destroy that antigen. T-cells mature in the thymus and are involved in cell-mediated immunity, which does not rely on antibodies to fight antigens, but rather the activation of macrophages, NK-cells, cytotoxic T-lymphocytes and various cytokines.

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Keywords: b-cell, biological, biology, cell, coloured, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, defence, false-colour, false-coloured, immune system, immunity, immunological, immunology, lymphocyte, medical, medicine, one, response, scanning electron micrograph, scanning electron microscope, sem, single, t-cell, wbc, white blood cell

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