hematopoyesis
DESCRIPTION
HematopoyesisTRANSCRIPT
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HEMATOPOYESIS
Mecanismo fisiológico responsable de la formación continuada de los distintos
elementos formes sanguíneos.
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Hematopoyesis EmbrionariaIslotes hemáticos del saco
vitelino. (Eritropoyesis)
Posteriormente es intraembrionaria
Hígado fetal y esplénica (menor contribución)
Médula ósea y tejidos linfáticos periféricos.
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Hematopoyesis AdultaHasta los 2 años la médula ósea
activa (roja) está en todos los huesos y gradualmente se va reemplazando por inactiva.
Adultos: epífisis de huesos largos, esternón, costillas, cráneo, vértebras y pelvis.
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•Médula Ósea: Tejido blando contenido en un estuche ósea que cede las células maduras a la circulación
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Sistema Hematopoyético
Divididos en 3 compartimentos:
Progenitores hemopoyeticosProgenitores medularesCélulas maduras
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GRANULOPOYESIS
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MieloblastoPromielocito
Mielocito
Metamielocito
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Neutrófilo
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Eosinófilo
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Basófilo
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MONOPOYESIS
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MEGACARIOPOYESIS
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LINFOPOYESIS
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Regulación de la HematopoyesisFactores de crecimientoEPO, TPO, FEC (factores
estimulantes de colonia), ILFactores inhibidoresINF, PG, MIP-1alfaFactores ReguladoresTGF-B, TNF alfa, Pentapétido P