opsonien

Opsonins are a type of antibody found in the bloodstream of mammals, including humans. They play a crucial role in the immune system's defense against infections. Opsonins are typically IgG antibodies that coat the surface of pathogens, such as bacteria or viruses, making them more susceptible to phagocytosis by immune cells like macrophages and neutrophils. This process, known as opsonization, enhances the immune system's ability to recognize and eliminate invading microorganisms. Opsonins are produced by B cells in response to specific antigens and are part of the humoral immune response. They are also involved in the clearance of dead or dying cells and the regulation of inflammation. The term "opsonin" comes from the Greek word "opsis," meaning "to see," reflecting the antibody's role in enhancing the visibility of pathogens to the immune system.