Which of these waves is the first positive wave in a normal cardiac cycle?

Question

Quizplus · Accepted Answer

The P wave is the first positive wave in a normal cardiac cycle and represents atrial depolarization. The Q wave is a small negative deflection that precedes the R wave in some leads and represents septal depolarization. The R wave is the first positive deflection after the Q wave and represents ventricular depolarization. The S wave is a downward deflection immediately following the R wave and represents completion of ventricular depolarization.

Which of These Waves Is the First Positive Wave in a Normal