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cardiac conduction system necklace | gold vermeil pp_neuro evolutionary biologistsCardiac conduction system necklace 18k gold vermeil A signal starts in the sinoatrial node, sweeps across both atria, slows at the atrioventricular node, then races down the bundle of His and out through the Purkinje fibres to fire both ventricles in synchrony. That signal is the cardiac conduction system, the heart's electrical circuit. The pendant traces the entire path, in 18k gold vermeil. The Science Behind the Cardiac Conduction System The