There is no difference between phagocytes and macrophages; they are different names for the same type of cells. A phagocyte is a monocyte that escapes from the wall of a blood vessel and transforms into a phagocyte once it enters the tissue. Phagocytes are also known as macrophages, which are larger in shape than monocytes and perform specific and non-specific immune functions when they enter the tissues. The non-specific immune function means that macrophages can engulf senescent cells and various cellular debris, and can also engulf various pathogenic microorganisms that invade the body. The specific immune function is that phagocytes can activate lymphocytes and other immune cells in the human body, such as activating B lymphocytes, stimulating B lymphocytes to produce antibodies and perform humoral immune function, and also activating T lymphocytes to perform cellular immune function. Therefore, phagocytes and macrophages are different names for the same kind of cells.