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

: They move from the bloodstream into tissues via the lymphatic vasculature using chemokine-directed "amoeboid movement". leucocyte

: Release histamine and other chemicals during inflammatory reactions. Agranulocytes : Lack visible granules and include: (also spelled leukocytes), commonly known as white blood

The primary role of leucocytes is to protect the body against infectious diseases and foreign entities. They achieve this through several critical processes: Classification of Leucocytes : They move from the

: Specific cell adhesion molecules (CAMs) allow leucocytes to stick to vascular endothelial cells, a process essential for reaching the site of an injury or infection.

: Large cells that migrate into tissues to become macrophages, which engulf debris and pathogens.