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Transcript of raul_musculos
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FUNCIONES DEL SISTEMAMUSCULAR
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FUNCIONES
POSTURA Y SOPORTE
Contracción parcial (levantarse, sentarse)
MOVIMIENTO
locomoción
PRODUCCION CALOR
homeostasis
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MICRO ANATOMÍA DEL MÚSCULOESQUELÉTICO
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MÚSCULO f ibras cel. Larga y cilíndrica 10-100 micrones
SARCOLEMACONTIENE
SARCOPLASMA
MIOFIBRILLAS
Tinción
Bandas
transversales
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Bandastransversales MIOFILAMENTOS
GRUESAS DELGADAS
MIOSINA ACTINA
Puntos se adhieren a
membrana intracelular
MEMBRANA Z
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SUBSTANCIAS
FOSFATO DE CREATINA(PC)
TRIFOSFATO DE ADENOSINA (ATP)
GLUCOSA ± IONES INORGANICOS:
Calcio (Ca )
Fos
f ato ( PO4 )
Sodio ( Na )
Potasio ( K )
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Sistema de Túbulos Intracelulares
RETICULO SARCOPLASMATICO
TÚBULOS T ± Comunican LIQUIDO EXTRACELULAR con RET. SARCOPLASMATICO
± Vía para el movimiento de substancias orgánicas e inorgánicas
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Túbulos T
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Estimulo
nerviosoPotencial de
acción Recorre
sarcolema
de la f ibra
Túbulos T
Retículosarcolplas
mático
Sarcoplasma
Ca++ Ca++
Ca++
Inicio
CONTRACCION
Bomba de Ca ++
En membrana
Ca++ Ca++
Ca++
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Tejidos conectivos
EPIMISIO
Rodea a todos los f ascículos
PERIMISIO
Rodea cada f ascículo
ENDOM
ISIO Rodea cada f ibra muscular