Body’s defense mechanisms against infection.?

answers1: We have a primary level of defense designed to keep invaders
out. Skin, mucus membranes, etc., but if they happen to get in, we
then have our immune system (think T cells, B cells, etc) to try and
combat any bacterial or viral invaders.
answers2: + The body has three lines of defense: <br>
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i) Physical (skin and mucous membranes) and chemical barriers that
prevent entry by pathogens, <br>
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ii)Non- specific defensive cells (phagocytes, eosinophils, and natural
killer cells) and proteins (interferons and complement system),
inflammation and feve <br>
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iii) The immune system that has specific targets and memory T-cells <br>
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That was just the basic, of course. I don't think you'd like to see
the specifics, but if you do want to, you can just google the rest...
of course, it depends on which level, what I've just describe should
be around general level, the teritiary level is far more in depth. :)
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Hope that helped!