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13 Señale la afirmación correcta:el nodo auriculoventricular inicia normalmente la contracción de las fibras musculares del corazón. El sistema nervioso simpático disminuye la fuerza y la frecuencia de contracción del corazón. El nodo sinoauricular sólo comienza la contracción del corazón si el nodo auriculoventricular falla. la hematopoyesis se produce a partir de las células madre pluripotenciales de la médula ósea roja Todas son ciertas

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