Without leukocytes the body’s immune system loses its ability to defend itself, resistance is reduced, and various infections occur frequently and are difficult to control.
Leukocyte is a spherical cell, all types of leukocytes are involved in the body’s defense function. The phagocytosis of leukocytes is selective and can engulf necrotic tissues and exogenous foreign bodies. They are divided into neutrophils, eosinophils, basophils, monocytes and lymphocytes.
1. Neutrophils: are the earliest effector cells to reach the site of inflammation during infection, and start the sterilization process immediately after phagocytosis of bacteria. They also phagocytose and remove senescent red blood cells.
2. Monocytes: Although monocytes are slow to chemotaxis, the dendritic cells they develop into are the most powerful cells known to date, and are the initiators of the body’s specific immune response.
3. Eosinophils: involved in the immune response to helminths, the role of basophils and mast cells in type I hypersensitivity.
4. Basophils: limit the role of eosinophils in allergic reactions, and in recent years it has been found that they may also have a role in the body’s anti-parasite immune response.
5. Lymphocytes: play a central role in the immune response.
Therefore, leukocytes play a very important role in the human body, if there is a lack of leukocytes the body’s immune function will collapse, resistance to decline, prone to various infections and difficult to control.