• Created by: kenneyn14
  • Created on: 04-04-19 13:42
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  • Lymphocytes
    • T-Lymphocytes
      • Destroy body cells infected by a pathogen by recognising antigens of the pathogen on the cells membrane
      • Attach to infected cells and release proteins
        • These proteins diffuse into  the infected cells causing the production of  self-destructive enzymes which cause cell death
          • This programmed cell death is called apoptosis
          • The remains of the cell are then engulfed and removed by phagocytosis
      • Can usually distinguish between Self-antigens and Non-Self antigens
        • Sometimes failure in an immune system leads to T-Lymphocytes launching an attack on 'self' antigens
          • This is called auto-immunity and is the cause of autoimmune diseases
    • B-Lymphocytes
      • produce specific anti-bodies against antigens and this leads to the destruction of the pathogen
        • An antibody is a Y-shaped molecule that has a receptor binding site specific to a particular antigen on a pathogen
          • When antibodies bind to an antigen they form an 'antigen-antibody complex' and inactivate the pathogen
            • The 'antigen-antibody complex' can then be destroyed by phagocytes
      • can respond to antigens on harmless antigens
        • This  can cause hypersensitive response in the form of an exaggerated immune resonse - allergic reaction
    • A type of white blood cells involved in the specific immune response
      • Produced in bone marrow
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