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Sumario Contracción del músculo esquelético
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Resumen de la contracción del músculo esquelético
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Guyton and Hall Textbook of Medical Physiology 14th Edition Test Bank by John E. Hall
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Test Bank For Guyton and Hall Textbook of Medical Physiology 14th Edition By John E. Hall; Michael E. Hall | | 9780323597128 | Chapter 1-85 | Complete Questions And Answers A+
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Test Bank Complete_ Guyton and Hall Textbook of Medical Physiology (Guyton Physiology) 14th Edition By John E. Hall & Michael E. Hall All Chapters 1-86| 14 Units| Newest Version with all Chapters| Wit...
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Contracción del músculo esqueléticoAproximadamente el 40% del cuerpo es músculo esquelético, y tal vez
otro 10% es músculo liso y cardíaco. Muchos de los principios de la
contracción se aplican a los tres tipos de músculo. En este capítulo se
estudia la función del músculo esquelético.
ANATOMÍA FISIOLÓGICA DEL MÚSCULO ESQUELÉTICO
Fibras del músculo esquelético.
En la mayoría de los músculos esqueléticos las fibras se extienden a
lo largo de toda la longitud del músculo. Cada fibra está inervada por
una sola terminación nerviosa.
Las miofibrillas están formadas por filamentos de actina y miosina.
Cada fibra muscular contiene de cientos a miles de miofibrillas y, a su
vez, cada miofibrilla está formada por aproximadamente 1.500
filamentos de miosina y 3.000 filamentos de actina adyacentes entre
sí. Estos filamentos son grandes moléculas proteicas polimerizadas
responsables de la contracción muscular. En la figura 6-1 los
filamentos gruesos son miosina y los delgados, actina, con las
siguientes características:
Bandas claras y oscuras. Los filamentos de miosina y de actina se
interdigitan parcialmente y, así, hacen que las miofibrillas tengan
bandas alternas claras y oscuras.
Las bandas claras contienen solo filamentos de actina y se denominan
bandas/. Las bandas oscuras, llamadas bandas A, contienen
filamentos de miosina así como los extremos de los filamentos de
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