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| body's second line of defense against invading organisms, in which fluid and white blood cells leak from blood vessels into tissues |
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| substance produced by body cells when they are attacked by viruses |
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| protein produced by the immune system in response to an antigen |
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| invading organism or substance that triggers the action of an antibody |
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| resistance to a disease-causing organism or a harmful substance |
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| immunity in which a person's own immune system responds to the presence of an antigen |
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| process by which an antigen is deliberately introduced to stimulate the immune system |
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| immunity that is gotten from another source |
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| reaction that occurs when the body is overly sensitive to certain substances called allergens |
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| Acquired Immune Deficiency Syndrome; disease in which certain cells of the immune system are killed by a virus called HIV |
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| disease transmitted by disease-causing microorganisms |
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| disease not caused by disease-causing microorganisms |
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| noninfectious disease in which the body's own cells multiply uncontrollably |
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| noninfectious disease in which the body either secretes too little insulin or is not able to use the insulin that is does secrete |
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| What is the body's second line of defense? |
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