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The myocardial muscle (aka myocardium or cardiac muscle) is what contracts to keep your blood flowing, but its actually the cardiac myocytes (muscle cells), which are called "autorhythmic", that keep it beating. Specifically, the SA node (sinoatrial node) is a patch of myocytes that is the pacemaker that initiates each heartbeat and determines the heart rate. Signals from the SA spread to the atrioventricular node (AV node) which acts as a gate to pass that charge to the atrioventricular bundle (AV bundle), which then disperses the charge to the purkinje fibers, which distribute the electrical charge to all mycocytes in the ventricles.

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