What defines granulocytes?

Granulocytes are defined by the presence of granules in their cytoplasm, which distinguishes them from other types of white blood cells. These granules contain various enzymes and antimicrobial substances that play significant roles in the immune response. The types of granulocytes—neutrophils, eosinphils, and basophils—each have distinct functions in fighting infections and responding to allergic reactions, among other roles in the immune system. The granules are critical for their ability to effectively perform tasks such as phagocytosis, releasing mediators, and performing a variety of other immune functions. This characteristic structure is what primarily defines this class of white blood cells.