leukosyytien
Leukocytes, commonly referred to as white blood cells, are essential cells of the immune system responsible for defending the body against infections, foreign substances, and malignant cells. They circulate in the bloodstream and are also found in lymphoid tissues such as the spleen, lymph nodes, and thymus.
Leukocyte production, or leukopoiesis, occurs primarily in the bone marrow from multipotent hematopoietic stem cells. The
The principal classes of leukocytes are neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Neutrophils constitute the largest
Leukocytes employ a variety of mechanisms—phagocytosis, degranulation, antibody production, and release of reactive oxygen species—to eliminate
Clinically, leukocyte counts are a routine diagnostic tool. Leukocytosis may indicate infection, inflammation, or hematologic disorders,