The primary role of the immune system's first line of defense is to

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The primary role of the immune system's first line of defense is to act as a barrier to prevent entry of pathogens. This includes physical barriers such as the skin and mucous membranes, as well as chemical barriers such as enzymes and acids that are present in bodily fluids. This initial barrier helps to prevent pathogens from entering the body and causing infection.

The Primary Role of the Immune System's First Line of Defense