Caption: T lymphocytes (pre-T cells) and granulocyte (neutrophil). Lymphocytes are involved in the specific immune response and are composed mainly of precursor T cells and B cells (pre-T cells and B cells). Pre-T cells and B cells are subsets of lymphocytes that originate in the red bone marrow from hematopoietic stem cells. Pre-T cells (also known as T lymphocytes) circulate in the blood before migrating to the thymus where they develop into specialized cells (helper T cells and killer T cells) that are able to identify antigens and infected tissue cells. Granulocytes are leukocytes with granules in their cytoplasm that contain destructive chemicals. Neutrophils are involved in inflammation and other immune responses. They assist in cellular defense (phagocytosis) of pathogenic microorganisms. Neutrophils travel from a capillary to infected regions where antibody / antigen complexes are located. A neutrophil destroys an antigen by engulfing it and injecting lethal chemicals.
Magnification*: x1,600
Type: SEM
Copyright 2000 Dennis Kunkel Microscopy, Inc.
Keywords: 20314B,human body,blood,human,white blood cell,T lymphocyte,T-lymphocyte,pre-T cell,granulocyte,granulocytic,neutrophil,immune response,inflammation,polymorphonuclear leukocyte,antibody,antigen,SEM,T cell