In maintaining the overall health of the human body, what is the immune system's first line of defense against invading pathogens?
In maintaining the overall health of the human body, the immune system's first line of defense against invading pathogens is: the nonspecific defenses, including the skin and mucous membranes.
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Asked 9/7/2012 11:27:00 AM
Updated 12/20/2016 5:21:44 PM
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