The primary role of leucocytes is to protect the body against infectious diseases and foreign entities. They achieve this through several critical processes:
: Key players in the adaptive immune system, further divided into T cells (cell-mediated immunity) and B cells (antibody production). Function and Mechanism
: Release histamine and other chemicals during inflammatory reactions. Agranulocytes : Lack visible granules and include: leucocyte
: Certain leucocytes, like neutrophils and macrophages, ingest and destroy harmful germs and cellular debris.
: The most numerous, acting as first responders to infection. The primary role of leucocytes is to protect
: They move from the bloodstream into tissues via the lymphatic vasculature using chemokine-directed "amoeboid movement".
: 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. Agranulocytes : Lack visible granules and include: :
(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
