noun, plural: phagocytes
Phagocytes pertain to a group of cells capable of rendering protection against bacteria and other foreign particles inside the body. Through the process of phagocytosis, they are able to destroy microorganisms by engulfing them and encasing them into a vesicle (phagosome), which pinches off from the cell membrane, and then fuses with the lysosomes. When this happens, the foreign particles inside the vesicle are broken down and digested. Apart from microorganisms, the phagocytes ingest cell debris and certain waste particles. Thus, in humans and other vertebrates, they are crucial in keeping the body healthy by destroying pathogens and in removing dead (or apoptotic) cells.
Phagocytes include white blood cells of the immune system, such as monocytes, macrophages, neutrophils, and mast cells. Dendritic cells (i.e. antigen-presenting cells) are also capable of phagocytosis. In fact, they are called professional phagocytes because they are effective at it.1