Which innate defense assists antibodies?

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Multiple Choice

Which innate defense assists antibodies?

Innate defenses can cooperate with antibodies to boost pathogen elimination, and the complement system is the best example of this. When antibodies bind to an antigen, they can activate the classical pathway of complement. This bridges innate and adaptive immunity and enhances the effectiveness of antibodies in several ways: C3b coats microbes to tag them for phagocytosis (opsonization), C3a and C5a promote inflammation and recruit immune cells, and the membrane attack complex can directly lyse target cells. Fever, interferons, and inflammation are important innate responses, but they don’t directly amplify antibody function the way complement does.

Innate defenses can cooperate with antibodies to boost pathogen elimination, and the complement system is the best example of this. When antibodies bind to an antigen, they can activate the classical pathway of complement. This bridges innate and adaptive immunity and enhances the effectiveness of antibodies in several ways: C3b coats microbes to tag them for phagocytosis (opsonization), C3a and C5a promote inflammation and recruit immune cells, and the membrane attack complex can directly lyse target cells. Fever, interferons, and inflammation are important innate responses, but they don’t directly amplify antibody function the way complement does.

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