The normal PR interval represents the amount of time it takes for the impulse to travel from the:
1. SA node to the ventricles.
2. AV node to the ventricles.
3. Bundle of His to the ventricles.
4. Purkinje fibers to the ventricles.
SA node to the ventricles.
Rationale: The PR interval, sometimes referred to as the PRI or PR segment, represents the time it takes for the impulse to travel from the SA node down the intra-atrial pathways to the ventricles. The normal PR interval is 0.12 to 0.20 seconds. In other words, it represents the beginning of the atrial contraction to the beginning of the ventricular contraction.
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