Final answer:
An immune complex consists of antigens and antibodies that form during the immune response, with B cells producing antibodies to target antigens for destruction, aided by complement activation.
Step-by-step explanation:
An immune complex is an aggregate of antigens and antibodies. The formation of these complexes is a crucial part of the immune response. Antigens are usually proteins that elicit an adaptive immune response by binding to specific receptors on immune cells. Upon encountering a foreign antigen, B cells of the adaptive immune system respond by producing antibodies. These antibodies precisely match and bind to their specific antigens, possibly targeting them for destruction by other immune cells. During complement activation, antibodies attached to the surface of a pathogen activate the complement system, which is part of the innate immune system and aids in the destruction of pathogens.