fisiologia del musculo esqueletico
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Transcript of fisiologia del musculo esqueletico
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FISIOLOGIA DEL SISTEMA MUSCULOESQUELETICO
ALVARO JOSE GONZALEZ TAPH
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Musculo Esquelé?co
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ORGANELAS DE LA CELULA MUSCULAR
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CELULA MUSCULAR
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aproximadamente 3.000 filamentos de ac#na y 1.500 de miosina dentro de cada miofibrilla
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FILAMENTO GRUESO • 200 moléculas de proteína (miosina)
• Enrollada en forma de hélice
• Cada molécula de miosina está formada por dos cadenas polipepXdicas enrolladas entre si
• Cada una presenta una porción globular y una cadena longitudinal.
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FILAMENTO DELGADO
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Está compuesto por tres proteínas: 1. Ac?na (armazón
de los filamentos delgados)
2. Troponina 3. Tropomiosina
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Modelo de unión Ac?na -‐ Miosina
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PLACA MOTORA Y TÚBULOS “T”
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Unidad Motora
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Modelo de la unión Mio-‐neural
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Bloqueos de la placa Neuromuscular Succinilcolina
Tubocurarina
Toxina Botulínica
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Invaginacion del Sarcolema “tubulos T”
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PROPAGACION DEL POTENCIAL DE ACCION
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RECEPTOR DHP Y RECEPTOR DE RYANODINE
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ReXculo S. – Túbulo T – ReXculo S.
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DESTINO DEL CALCIO
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SARCÓMERO
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Longitud de las miofibrillas Vs tensión Muscular
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Huso Muscular
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Contracción Isométrica Vs Isotónica
Cargar un niño Llevarse un vaso a la boca y volverlo a dejar sobre una superficie
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Es?mulo por Ace?lcolina
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MUSCULO LISO • Banda H si ?ene cabezas pesadas de miosina “contracción mas sostenida y con menos gasto de ATP”. • Inervación mul?unitaria en vísceras “peristal?smo”
• Troponina reemplazada por Calmodulina
• Caldesmona cumple función con la tropomiosina.
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Calmodulina. “si?o de unión al calcio”
caldesmona
Funciones del Calcio: • Despeja el si?o de unión de la ac?na con la miosina. • Ac?va la Cinasa de la cadena ligera. • El Atp se hidroliza sobre la cabeza pesada de miosina y además desenrolla la cadena ligera