The first line of defense includes physical barriers like intact skin and mucous membranes, and the second line involves inflammation and phagocytosis. The third line is the specific immune response. Examples of nonspecific defenses are intact skin, chemicals like stomach acid, and cells like macrophages.
The first line of defense includes physical barriers like intact skin and mucous membranes, which prevent pathogens from entering the body. The second line of defense involves the inflammatory response and phagocytosis by nonspecific leukocytes to combat pathogens that manage to penetrate the initial barriers.
The third line of defense is the specific immune response that targets specific pathogens and provides immunity upon subsequent exposures.
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