agranulocyte
[A-gran-yoo-lo-SITE] A type of white blood cell; monocytes and lymphocytes are agranulocytes. | ||||
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Agranulocyte definition was found in categories: Medicine(1) Encyclopedia(1)
Agranulocyte Definition from Medicine Dictionaries & Glossaries
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agranulocyte
a type of white blood cell (e.g., macrophage, lymphocyte) that does not contain granules of toxic chemicals.
a type of white blood cell (e.g., macrophage, lymphocyte) that does not contain granules of toxic chemicals.
Agranulocyte Definition from Encyclopedia Dictionaries & Glossaries
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Agranulocyte
Agranulocytes are a category of white blood cells characterised by the absence of granules in their cytoplasm.
There are two types of agranulocytes:
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.
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