Leucocyte

(also spelled leukocytes), commonly known as white blood cells (WBCs) , are the mobile units of the body's defensive system. They are produced in the bone marrow and lymph tissue and are distributed throughout the blood and lymphatic systems. Unlike red blood cells, all leucocytes have nuclei, which is their primary distinguishing feature. Classification of Leucocytes

Leucocytes are generally classified by their cell lineage into or lymphoid cells and further divided based on the presence of granules in their cytoplasm: Granulocytes : Contain visible granules and include: leucocyte

: They move from the bloodstream into tissues via the lymphatic vasculature using chemokine-directed "amoeboid movement". (also spelled leukocytes), commonly known as white blood

: Primarily involved in battling parasitic infections and allergic responses. (also spelled leukocytes)