C3b and Fc receptors are present on which types of cells?

The presence of C3b and Fc receptors on B lymphocytes and monocytes is essential for their roles in the immune response. C3b is an important component of the complement system that enhances phagocytosis and facilitates opsonization, marking pathogens for destruction by immune cells. B lymphocytes have receptors that recognize C3b, allowing them to effectively respond to antigens that have been opsonized, thus aiding in antibody production and leading to more efficient pathogen clearance.

Monocytes, which can differentiate into macrophages and dendritic cells, express Fc receptors that bind the Fc portion of antibodies. This interaction is critical for the opsonization process, where antibodies coat pathogens, enhancing their recognition and uptake by phagocytes. The engagement of C3b and Fc receptors on these cells helps coordinate the immune response and promote effective antigen processing and presentation.

Other cell types listed in the choices may have distinct roles in the immune response, but they do not typically exhibit significant levels of both C3b and Fc receptors as seen in B lymphocytes and monocytes. For instance, T lymphocytes, while crucial for the adaptive immune response, primarily function through the recognition of antigens presented by other cells rather than opsonization. Likewise, neut