A patient's heart rate is regular at 68 beats per minute.The electrocardiogram (ECG)tracing shows P waves before every QRS complex.What is the likely pacemaker of the heart?

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The SA node initiates electrical impulses at a rate of 60 to 100 per minute.When the ECG shows P waves before every QRS complex with a rate between 60 and 100 per minute,the rhythm is a normal sinus rhythm which is initiated by the SA node.

A Patient's Heart Rate Is Regular at 68 Beats Per