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MCAT Question A Day - 3/22/14 - Answer!

The human body has various ways to protect itself against pathogens, including specific and nonspecific defense mechanisms. The nonspecific defenses do not distinguish one pathogen from another. Which of the following would not be considered a component of the nonspecific defenses?

A.  Macrophages
B.  Inflammation
C.  Antibodies
D.  Interferon

The correct answer is (C). A basic knowledge of the immune system is required. Although specific defense vs. nonspecific defense is defined in the question, one still must have some understanding of the roles of the various choices. Phagocytosis by macrophages, inflammation, and interferon are all general, nonspecific responses by the immune system. Each type of antibody, on the other hand, is normally produced in response to a specific antigen (usually associated with a specific invading organism).

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