NationMaster - Encyclopedia: Agranulocyte

Agranulocytes are a category of white blood cells characterised by the absence of granules in their cytoplasm. White blood cells (a. ... A granule is a small grain. ... Cytoplasm is like jelly-like material that fills cells. ...

Lymphocytes are much more common in the lymphatic system, and include the so-called "natural killer T-cells". The blood has three types of lymphocytes: B cells, T cells and natural killer cells. B cells make antibodies that bind to pathogens to enable their destruction. CD4+ (helper) T cells co-ordinate the immune response (they are what becomes defective in an HIV infection). CD8+ (cytotoxic) T cells and natural killer cells are able to kill cells of the body that are infected by a virus. T cells are crucial to the immune response because they possess a unique 'memory' system which allows them to remember past invaders and prevent disease when a similar invader is encountered again. Lymphocyte (stained) A lymphocyte is a type of white blood cell involved in the human bodys immune system. ... Monocyte A monocyte is a leukocyte, part of the human bodys immune system that protect against blood-borne pathogens and move quickly to sites of infection in the tissues. ... B cells are lymphocytes that play a large role in the humoral immune response (as opposed to the cell-mediated immune response). ... T cells are a subset of lymphocytes that play a large role in the immune response. ... Natural killer cells (NK) are a type of lymphocyte (a white blood cell) and a component of nonspecific immune defense. ...

Monocytes share the "vacuum cleaner" (phagocytosis) function of neutrophils, but are much longer lived as they have an additional role: they present pieces of pathogens to T cells so that the pathogens may be recognised again and killed, or so that an antibody response may be mounted. Monocytes are also known as macrophages after they migrate from the bloodstream and enter tissue. Neutrophil granulocytes (commonly referred to as neutrophils) are a class of white blood cells and are part of the immune system. ... Macrophages (Greek: big eaters) are cells found in tissues that are responsible for phagocytosis of pathogens, dead cells and cellular debris. ...

Other white blood cells which are not agranulocytes are mainly the granulocytes neutrophils, eosinophilss and basophils. Granulocytes are a category of white blood cells, characterised by the fact that all types have differently staining granules in their cytoplasm on light microscopy. ... Neutrophil granulocytes (commonly referred to as neutrophils) are a class of white blood cells and are part of the immune system. ... Eosinophil granulocyte Eosinophil granulocytes, commonly referred to as eosinophils (or less commonly as acidophils), are white blood cells that are responsible for combating infection by parasites in the body. ... Categories: Wikipedia cleanup | Biology stubs | Blood and immune system cells ...

See also

Category: Blood cells White blood cells (a. ... A full blood count (FBC) or complete blood count (CBC) is a test requested by a doctor or other medical professional that gives information about the cells in a patients blood. ... Human blood smear: a - erythrocytes; b - neutrophil; c - eosinophil; d - lymphocyte. ... Blood plasma is the liquid component of blood, in which the blood cells are suspended. ... Sketch of bone marrow and its cells Pluripotential hemopoietic stem cells or pluripotential hematopoietic stem cells (PHSCs) are stem cells found in the bone marrow. ... Human red blood cells Red blood cells are the most common type of blood cell and are the vertebrate bodys principal means of delivering oxygen from the lungs or gills to body tissues via the blood. ... Reticulocytes are immature red blood cells, that normally comprise about 1% of the red cells in the human body. ... A normoblast (or erythroblast) is a type of red blood cell which still retains a cell nucleus. ... White blood cells (a. ... Lymphocyte (stained) A lymphocyte is a type of white blood cell involved in the human bodys immune system. ... Lymphoblasts are interferons produced predominantly by leucocyte cells. ... T cells are a subset of lymphocytes that play a large role in the immune response. ... A cytotoxic (or TC) T cell is a T cell (a type of white blood cell) which has on its surface antigen receptors called T-cell receptors (TCRs) that can bind to fragments of antigens displayed by the Class I MHC molecules of virus (or other intracellular pathogen) infected somatic... T helper cells (also known as effector T cells or Th cells) are a sub-group of lymphocytes (a type of white blood cell or leukocyte) that play an important role in establishing and maximising the capabilities of the immune system. ... Regulatory T cells (also known as suppressor T cells) are a specialized subpopulation of T cells that act to suppress activation of the immune system and thereby maintain immune system homeostasis and tolerance to self. ... Natural killer T cells (NK T cells) are a type of lymphocyte, or white blood cell. ... B cells are lymphocytes that play a large role in the humoral immune response (as opposed to the cell-mediated immune response). ... Plasma cells (also called plasma B cells or plasmocytes) are cells of the immune system that secrete large amounts of antibodies. ... Memory B cells are a B cell sub-type that are formed following primary infection. ... Natural NK cells are cytotoxic; small granules in their cytoplasm contain special proteins such as perforin and proteases known as granzymes. ... Sketch of bone marrow and its cells Pluripotential hemopoietic stem cells or pluripotential hematopoietic stem cells (PHSCs) are stem cells found in the bone marrow. ... Myeloblasts or blasts are new, immature blood cells developed in the bone marrow that are the precursors of myelocytes. ... Granulocytes are a category of white blood cells characterised by the presence of granules in their cytoplasm. ... Neutrophil granulocytes, generally referred to as neutrophils, are the most abundant type of white blood cells and form an integral part of the immune system. ... Eosinophils are white blood cells that are responsible for combating infection by parasites in the body. ... Basophil granulocyte Basophils are the least common of the granulocytes, representing about 1% of circulating leukocytes. ... Mast cells A mast cell (or mastocyte) is a resident cell of connective tissue that contains many granules rich in histamine and heparin. ... Monocyte A monocyte is a leukocyte, part of the human bodys immune system that protect against blood-borne pathogens and move quickly to sites of infection in the tissues. ... A Histiocyte is a cell that is part of the human immune system. ... A macrophage of a mouse stretching its arms to engulf two particles, possibly pathogens Macrophages (Greek: big eaters, makros = long, phagein = eat) are white blood cells, more specifically phagocytes, acting in the nonspecific defense as well as the specific defense system of vertebrate animals. ... Dendritic cells (DC) are immune cells and form part of the mammal immune system. ... Langerhans cells are immature dendritic cells containing large granules called Birbeck granules. ... Microglia are a type of glial cell that act as the immune cells of the Central nervous system (CNS). ... Kupffer cells are reticulendothelial cells located in the liver. ... An osteoclast is a multinucleated cell that degrades and reabsorbs bone. ... A megakaryoblast is a precursor cell to a promegakaryocyte, which in turn becomes a megakaryocyte. ... The megakaryocyte is a bone marrow cell responsible for the production of blood platelets when its cytoplasm becomes fragmented. ... A 250 ml bag of newly collected platelets. ...