Definition of Phagocyte
Granulocytes, and in particular neutrophils, are the primary phagocytes in the circulating blood.
Macrophages are phagocytes that reside primarily in the lymph structures and the tissues. Protein markers on the surface of the pathogen, called opsonins, attract phagocytes to the pathogen’s location.
The phagocyte extends its wall to encircle the pathogen, then releases enzymes that digest the pathogen. An individual phagocyte may digest up to a dozen pathogenic particles during the course of its existence.