The duration of the PR interval on an electrocardiogram (ECG) reflects the time required for:
A) depolarization and conduction through the ventricles.
B) conduction from the sinoatrial (SA) to the atrioventricular (AV) node.
C) depolarization and repolarization of the ventricles.
D) conduction from the atrioventricular (AV) node to the sinoatrial (SA) node.
Correct Answer:
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