Innate immunity is the first line of defense against invading pathogens. Its mechanisms of action are non-specific toward the invading pathogen. Some of the major features of innate immunity include: the complement cascade, phagocytosis, Toll-Like Receptors, chemotaxis, and extravasation. Skin and stomach acid serve as physical barriers to pathogens. Phagocytosis can lead to antigen presentation, which bridges innate and adaptive immunity.
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