functions of blood- preventing infection

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  • functions of blood (preventing infection)
    • role of the immune system
    • leucocytes involved in immune response
    • pathogens: disease causing organisms
      • e,g, bacteria, viruses and parasites
      • these will be recognised as a threat by cells
    • antigens: neutrophils and lynphocytes
      • form special proteins
        • called antibodies
          • immobilise bacteria
    • monocytes: kill and break down bacteria
    • viruses cannot live independently
      • hijacks a cell to survive
        • change the outside of the infected cell
          • lymphocytes recognise this
            • latch onto the cell and destroy it

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