: Key players in the adaptive immune system, further divided into T cells (cell-mediated immunity) and B cells (antibody production). Function and Mechanism
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
: Certain leucocytes, like neutrophils and macrophages, ingest and destroy harmful germs and cellular debris. : Key players in the adaptive immune system,
: Release histamine and other chemicals during inflammatory reactions. Agranulocytes : Lack visible granules and include: like neutrophils and macrophages
: They move from the bloodstream into tissues via the lymphatic vasculature using chemokine-directed "amoeboid movement".