Agranulocyte
Agranulocytes are a category of
white blood cells characterised by the absence of
granules in their
cytoplasm.There are two types of agranulocytes:
LymphocytesMonocytes.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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Granulozyt
Granulozyten (
Singular der Granulozyt) sind bestimmte weiße Blutkörperchen und machen 45 - 75 % aller
Leukozyten aus. Granulozyten werden im
Knochenmark gebildet und ins
Blut abgegeben. Ihre Lebensdauer beträgt zwei bis drei Tage. Der Abbau der Granulozyten erfolgt im
mononukleären Phagozytosesystem (
Monozyten). Sie können die Blutbahn verlassen und ins
Gewebe einwandern. Ihre Funktion liegt vor allem in der unspezifischen Abwehr (angeborenen Immunantwort) von
Bakterien,
Parasiten und
Pilzen. Einige Granulozyten sind dabei in der Lage, Krankheitserreger in sich aufzunehmen und zu zerstören. Diese werden daher zu den "Fresszellen" gezählt.
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Agranulocyt
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Granulocita
I granulociti sono un tipo di
globuli bianchi; sono così definiti poiché contengono delle granulazioni nel loro
citoplasma dalle cui affinità tintoriali dipende la loro classificazione. Queste granulazioni assumono poco i coloranti acidi e basici nei
neutrofili, mentre si colorano con coloranti acidi negli
eosinofili e con quelli basici nei
basofili. Sono anche noti come leucociti nucleopolimorfi (PMN o PML) per via della forma variabile del loro nucleo cellulare, che di solito è trilobato. La maggior parte dei granulociti presenti nel sangue sono neutrofili: in effetti, i termini "granulocita" e "neutrofilo" sono spesso usati in modo intercambiabile nella letteratura medica.
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Granulocyt
Een granulocyt is een type
witte bloedcel die gekarakteriseerd wordt door de aanwezigheid van granulen in het cytoplasma. Ze worden ook wel polymorfonucleaire leukocyten genoemd, vanwege de variërende vorm van de
celkern, welke meestal drie segmenten bevat. Met de term polymorfonucleaire leukocyten wordt vaak enkel gerefereerd naar
neutrofiele granulocyten. Granulocyten worden vrijgesteld uit het beenmerg onder invloed van
complement.
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