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Describe the role of each component of the ECG in the heart's contraction: the P wave, the PR interval, the QRS complex, the ST segment, the T wave, and the QT interval.P wave represents atrial depolarization. PR interval represents the time required for atrial depolarization, the impulse delay in the AV node, and the travel time to the Purkinje fibers. QRS complex represents ventricular depolarization. ST segment represents early ventricular repolarization. T wave follows the ST segment and represents ventricular repolarization. QT interval represents the totaltime required for ventricular depolarization and repolarization.What is the difference between artifact and dysrhythmia?