7. Macrophages recognize target cells using which of the following? A. MHC class I molecules B. Toll-like receptors C. MHC Class II molecules D. Killer cell inhibitory receptors 8. The defense mechanism carried out by NK cells involves: A. recognition of a specific antigen. B. MHC class II-mediated killing. C. perforin- and granzyme-mediated killing D. phagocytosis. 9. All of the following are considered acute-phase reactants EXCEPT: A. fibrinogen. B. complement. C. C-reactive protein. D D. TNF-alpha

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Defense Mechanism

Circumstances influence and compel people to behave in a certain way. One such behavior is a defense mechanism. It is employed by people to escape from unpleasant circumstances, thoughts and actions. Defense mechanisms are, thus, psychological strategies that help to avert and avoid unwanted feelings such as guilt or shame and situations such as threat and danger.