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En referencia al ciclo cardiaco señalar la correcta:a. En la fase de contracción isovolumétrica no hay cambios en el volumen ventricular ni en la longitud delas fibras cardiacas, pero si en el tonob. En la fase de eyección la válvula pulmonar está abiertac. Tras la diástole ventricular viene un periodo refractario antes de producirse la sístole auriculard. Todas son ciertas

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