immune system

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Last updated 6:26 AM on 6/17/26
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4 Terms

1
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first line of defense

external, non-specific protection

prevent pathogens from entering

skin and mucous membranes

2
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second line of defense

prevent the spread of pathogens that penetrated the first line of defense

macrophages, inflammation, and complement

3
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histamine

increases during allergic reactions

causes vasodilation, increasing permeability to macrophages

4
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complement

draws macrophages to the site of infection