Card 10 / 16: The heart's internal pacemaker beats by:
a.) an internal implant that sends an electrical impulse through the heart
b.) the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node
c.) the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node
d.) the action of the sinus

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