Which of the following is also known as the pacemaker of the heart?
A) atrioventricular node
B) Purkinje fibers
C) atrioventricular bundle
D) sinoatrial node
D
Explanation: The sinoatrial node is known as the pacemaker of the heart. It is the beginning of the heart's electrical conduction system. The impulse travels down the internodal pathway to the atrioventricular node, to the atrioventricular bundle, to the bundle branches, and into the Purkinje fibers.
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