yuleneg yuleneg

24-01-2017
Health

contestada

If foreign substances pass the body's first line of defense and into the bloodstream what happens

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zaynmalik93 zaynmalik93

24-01-2017

The good cells attack it and try to kill it if its a bad substance

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elizabethbair51 elizabethbair51

26-01-2017

they are attacked by lymphocytes

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