The first line of body defense is:

Question

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The first line of defense or first barrier to infection is unbroken skin and mucosal membrane surfaces.Normal biota deter penetration or facilitate elimination of foreign microorganisms from the body.Other types of first-line defenses against microbial invasion include secretions (e.g.,mucus,ear wax,lactic acid in sweat,stomach acid,saliva,and tears).Additional protection is provided to the respiratory tract by the constant motion of the ciliated epithelial cells.

The First Line of Body Defense Is