make antibodies that attack foreign invaders
It is white blood cell that circulates in the body and body fluids that is involved in counteracting substances and disease; white blood cell. There are various types of leukocytes which are the lymphocytes, granulocytes, monocytes and macrophages. These are the cells of the immune system that are involved in protecting the body against infectious diseases and foreign invaders. This is usually elevated in infections and some inflammatory conditions.