text: The ventricular muscle twitches randomly , rather than contracting in a coordinated fashion ( from the apex of the heart to the outflow of the ventricles ) , and so the ventricles fail to pump blood into the arteries and into systemic circulation .
simplified: The ventricular muscle twitches randomly when it should contract in unison , and the ventricles can not pump blood into the arteries and into the systemic circulation .