The Normal Pacemaker of the Heart Is the _____ Node

question 53

Multiple Choice

The normal pacemaker of the heart is the _____ node, which is found in the _____ atrium, and has an intrinsic firing rate of _____ beats/min.

• A) sinoatrial; left; 40 to 60
• B) sinoatrial; right; 60 to 100
• C) atrioventricular; left; 20 to 40
• D) atrioventricular; right; 100 to 180

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