What is one of the main roles of the complement system in immunity?

• A. Stimulating fever
• B. Promoting antibody production
• C. Enhancing phagocytosis
• D. Inhibiting blood clotting

Answer: (C)

One of the main roles of the complement system in immunity is to enhance phagocytosis. The complement system comprises a series of proteins that play a critical role in the immune response, particularly in the opsonization process. Opsonization refers to the marking of pathogens for destruction by immune cells, particularly phagocytes like macrophages and neutrophils.

When complement proteins are activated, they can bind to pathogens and coat them, which significantly improves the ability of phagocytes to recognize and engulf these invaders. This process not only increases the efficiency of phagocytosis but also helps to facilitate the clearance of pathogens from the body. Additionally, the complement system can promote inflammation and attract more immune cells to the site of infection, further supporting the immune response.

In contrast, the other options mentioned do not primarily represent the key functions of the complement system. While stimulating fever can be part of the broader immune response, it is not a direct function of the complement system. Promoting antibody production is mainly the role of B cells and helper T cells rather than the complement proteins themselves. Inhibiting blood clotting pertains to different mechanisms in the body, primarily those involving anticoagulants and does not relate to the functions of the complement