Word: auriculoventricular
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...heart's ignition system. Normally, a current is generated for each beat at the "sinus node" (situated where blood enters the upper right heart). The charge then passes through the walls of the two upper chambers (auricles), making them contract. Then the signal is channeled through the auriculoventricular node (where the heart's four chambers meet), and passes through the ventricles' walls...
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