Physiology Electromechanical Systole is best defined as the interval between A Q wave and S2 (Q-S2 Interval) B Q wave and SI (Q-Sl Interval) C Q wave and beginning of T wave D Q wave and R wave 💡 Explanation Electromechanical Systole is best defined as the interval between ✓ Correct Answer: A. Q wave and S2 (Q-S2 Interval)