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English[en]
If the cardiac muscles just contracted and relaxed randomly at a natural rhythm the cycle would become disordered and the heart would become unable to carry on its function of being a pump.
Spanish[es]
Si los músculos cardíacos apenas se contrayeran y relajaran al azar a un ritmo natural, el ciclo se desordenaría y el corazón se volvería incapaz de llevar a cabo su función de ser una bomba.

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