How is the skin the body's first line of defense?
a. It secretes oil, which washes away...
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How is the skin the body's first line of defense?
a. It secretes oil, which washes away pathogens.
b. It secretes sweat, which raises the pH of the skin and kills pathogens.
c. It forms a physical barrier to keep pathogens out.
d. It traps pathogens in the many flagella that line mucous membranes.
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