Leucocytes (white blood cells)

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  • Leucocytes (white blood cells)
    • Lymphocytes
      • T lymphocytes
        • Some become T-killer cells. These just kill any cell that shows signs of infection. They kill using a chemical like hydrogen peroxide.
        • Some become T-helper cells. These secrete cytokines which stimulate B lymphocytes to produce memory cells.
      • B lymphocytes
        • These undergo clonal selection and expansion. This is when the lymphocyte with the right antibody on it is chosen to fight the pathogen and multiplied via mitosis.
          • Some then are converted into plasma cells which produce antibodies,
    • Phagocytes
      • Neutrophills
        • These are the most common types of white blood cells. They engluf any pathogen that they come accross via phagocytosis.
      • Macrophages
        • These engulf a pathogen and incorporate its' antigen onto its cell surface membrane. This is then used to recognise the antigen causing other lymphocytes or neutrophills to get rid of it.


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