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Sumario CONTROL NERVIOSO Y HORMONAL DE LA CONTRACCIÓN DEL MÚSCULO LISO
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RESUMEN DE LA CONTROL NERVIOSO Y HORMONAL DE LA CONTRACCIÓN DEL MÚSCULO LISO
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Guyton and Hall Textbook of Medical Physiology 14th Edition Test Bank by John E. Hall
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CONTROL NERVIOSO Y HORMONAL DE LA CONTRACCIÓN DELMÚSCULO LISO
esta reacción precisa otra enzima, la miosina fosfatasa, que escinde el
fosfato de la cadena ligera reguladora; entonces se interrumpe el ciclo
y se produce la relajación.
Las uniones neuromusculares del tipo muy estructurado que se
encuentran en las fibras del músculo esquelético no aparecen en el
músculo liso.
Uniones difusas. Son los lugares de secreción de la sustancia
transmisora. En la mayoría de los casos, las fibras nerviosas
autónomas forman las denominadas uniones difusas, que segregan su
neurotransmisor en la matriz que recubre el músculo liso, desde donde
difunde una corta distancia hacia las fibras.
Varicosidades de los terminales de axones. Los axones que inervan
las fibras musculares lisas no tienen los extremos terminales
ramificados típicos que se ven en la placa motora terminal de las fibras
musculares esqueléticas.
Por el contrario, la mayoría de los axones terminales delgados tiene
múltiples varicosidades distribuidas a lo largo de sus ejes. Las
varicosidades contienen vesículas cargadas con la sustancia
neurotransmisora.
Uniones de contacto. En el músculo liso de tipo multiunitario las
varicosidades se encuentran directamente sobre la membrana de la
célula muscular. Las llamadas uniones de contacto actúan de manera
muy similar a las uniones neuromusculares del músculo esquelético.
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