The complement system carries out all of the following functions, EXCEPT

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When evaluating the complement system’s roles, consider what it does to combat infection and what it does not directly do.
Option A: Recruiting additional phagocytic cells to the infection site. This is a recognized function of complement, particularly through anaphylatoxins like C3a and C5a that attract neutrophils and other phagocytes to the area of infection, helping to amplify the immune response.
Option B: Immune Clearance (housekeeping). The complement system participates in immune clearance by binding immune complexes and facilitating their removal from circulation, effectively helping to “housekeep” and prevent immune complex deposition.
Option C: Puncturing the cell membranes of certain bacteria. This describes the formation of the membrane attack complex (MAC), which creates pores in the membranes of target pathogens, leading to lysis; this is a direct and central function of the complement cascade.
Option D: Engulfing and phagocytosis (eating) of the bacterial. While complement opsonization enhances phagocytosis, the actual engulfment and internalization of bacteria are performed by phagocytes (e.g., neutrophils, macrophages) rather than by the complement system itself. Therefore, this statement describes a process that complement does not execute directly, making it the exception.

The complement system carries out all of the following functions, EXCEPT

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