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Tears flush away foreign particles from the ocular surface, as well as distributing immunoglobins and antimicrobial proteins.

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Plasma B cells reside in the salivary glands and produce antibodies. Thus, providing a barrier against potentially dangerous pathogens that may get in your body through your mouth.

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The nose hairs help prevent large particles from getting past the nostrils and into the nasal cavity.

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The skin acts as a barrier between invaders and your body. It forms a waterproof mechanism.

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The first line of defense consists of physical and chemical barries that are always ready and prepared to defend the body from infections.