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5 / 41  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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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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