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