cell recognition
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how are ‘self cells’ recognised?
labelled with unique proteins to prevent lymphocytes destroying them
how do lymphocytes know which cells to destroy?
other proteins (usually antigens) detected
state 4 examples of cells that lymphocytes destroy
• cancer cells • toxins produced by pathogens • pathogens • cells from other organisms
what causes an autoimmune disease?
• the immune system identifies self cells as foreign and white blood cells sometimes attack them • T regulator cells don’t work so immune response is not regulated
what is rheumatoid arthritis?
• attacks cartilage in joints • causes inflammation and pain
what is lupus?
• inflammation of joints, skin and organs • causes fatigue • no cure but can be relieved with anti inflammatories