Answer:
Step-by-step explanation:
The PR interval spans from the beginning of the p-wave to the beginning of the QRS complex, and it represents the time from the beginning of atrial depolarization to the beginning of ventricular depolarization. It's normally 0.12-0.20 seconds, which is three to five little boxes, since each little box is 0.04 seconds.Mar 24, 2020
