Membrana Celular Y Sistema De Endomembrana
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Transcript of Membrana Celular Y Sistema De Endomembrana
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Membrana celular
Eugenia Grisolia
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Transporte por cambio conformacional
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Carrierproteina a través de la membrana
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Transporte activo
• Proceso que requiere Energía (ATP)
• Transporte selectivo de moléculas de menor a mayor concentración
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Bomba de Na+ - K +
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Bomba de sodio y potasio, un ejemplo de transporte activo
FUERA DE LA MEMBRANA
DENTRO DE LA MEBRANA (CELULA)
Na+ sale por transporte
activo
K+ entra por
transporte activo
(2)
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Sodium-Potassium PumpProteina intrínseca permite entrada de Na
Proteina de membrana permite salida de K+
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Dilución
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• Paso del agua mediante una membrana semipermeable de una solución menos concentrada a una de mayor concentración (paso agua de menor a mayor)
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Modificaciones de membrana
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Sistema de Endomembranas
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Envoltura nuclear
Envolturanuclear
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La envoltura nuclear es una doble membrana
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RETICULO ENDOPLASMATICO
RER
REL
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Funciones del RE
• Transporte de sustancias dentro de la célula
• Sostén mecánico
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RERFunción • Síntesis de proteínas
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REL
Funciones:
• Síntesis de lípidos • Detoxificación • Glucogenólisis
REL
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Complejo de Golgi
Funciones• Secreción
• Glicosidación
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Flujo de membranas
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Endocitosis –Exocitosis
endocitosis
exocitosis
FagocitosisPinocitosis
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EXOCITOSIS POR VESICULAS TRANSPORTADORAS
EXOCITOSIS DE MEMBRANA
Salida de sustancias mediante vesículas de secreción