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Which of the following are part of the body s first line of defense against pathogens? a. white blood cells b. red blood cells c. lymph nodes d. mucous membranes
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Which of the following are part of the body s first line of defense against pathogens?

a. white blood cells
b. red blood cells
c. lymph nodes
d. mucous membranes

User Mong Zhu
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1 Answer

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D, Mucous membranes are not within the body, thus they are the first of all the options that would encounter pathogens.
User Spadelives
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