: Primarily involved in battling parasitic infections and allergic responses.
: Release histamine and other chemicals during inflammatory reactions. Agranulocytes : Lack visible granules and include: leucocyte
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: : Primarily involved in battling parasitic infections and
: Certain leucocytes, like neutrophils and macrophages, ingest and destroy harmful germs and cellular debris. : They move from the bloodstream into tissues
: They move from the bloodstream into tissues via the lymphatic vasculature using chemokine-directed "amoeboid movement".
: Large cells that migrate into tissues to become macrophages, which engulf debris and pathogens.
The primary role of leucocytes is to protect the body against infectious diseases and foreign entities. They achieve this through several critical processes: