Against All
How is the immune system able to protect the body against all potential invaders without knowing in advance?
How is the immune system able to protect the body against all potential invaders without knowing in advance what those invaders are like?
your immune system has the ability to differentiate your own cells as oppose to foreign cells by a protein on cells called MHC. When encountering a new invader, cells that are not recognized by the cytotoxic (killer) T cells are attacked and killed.
Helper T cells then activate B cells which secrete anti-bodies which will mark the new invaders so other T cells can recognize it and kill it.
If the same pathogen invades again, memory B cells then be able to quickly recognize it. Antibodies would then be quickly produced and T cells would quickly kill off the pathogen without us feeling “sick.”
Phil Collins – Against All Odds – Live Aid 1985 – London, England
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