Disease Prevention

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  • circulate in blood and spread into tissue during an infection
  • rapid reaction force of immune system- rush to infected are and try to kill the pathogens
  • don't last long
  • after engulfing the bacteria they die- sometimes accumulate to form pus 
  • number increases during an infection
  • pour out of bone marrow, circulate in blood and leave through capillary walls to damaged tissue
  • die soon after
  • can digest way through to linings to get to tissue
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  • pass out of blood stream and into tissue where they form macrophages
  • long-lived cells
  • special role in specific defence system by processing and 'presenting' antigens to lymphocytes
  • some migrate
  • others stationary in certain tissues- Kidneys/Lungs/Brain/Liver/Spleen/Lymph nodes (where a lot of antigen presentation occurs
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Dendritic Cells

Dendritic Cells

  • long processes which give large surface areas to interact with pathogens and lymphocytes
  • often found throughout body
  • once they gave ingested some foreign material they migrate and take the material to the lymph nodes
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