62 Understand how the immune system responds to disease using white blood cells, illustrated by phagocytes and lymphocytes.

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7 Terms

1
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what are white blood cells

leukocytes —> phagocytes and lymphocytes

2
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what do phagocytes do

engulf foreign cells (phagocytosis)

3
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describe the process of phagocytosis

  1. membrane surrounds the bacterium

  2. bacterium is enclosed in vacuole

  3. digestive enzymes destroy bacterium

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type of phagocyte

macrophage

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what do lymphocytes do

produce antibodies

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what do antibodies do

  • recognising antigens from outside of pathogen

  • taken to the lymphatic system + stimulates an immune response

  • active cells divide and produce antibodies + some are saved as memory cells for future infections

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how does vaccination work

  • weak, live version of virus injected

  • triggers lymphocytes (T-cells) to create antibodies

  • 1 antibody specific to one antigen

  • antibody saved as memory cells for next time to avoid pathogen having time to develop