Which ECG element is described as representing active electrical contraction/relaxation with groups of waves?

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Multiple Choice

Which ECG element is described as representing active electrical contraction/relaxation with groups of waves?

Explanation:
Groups of waves on an ECG form a complex, which names a single electrical event. A wave is one deflection, like the P, QRS, or T. A segment is a flat stretch between waves, and an interval is a span of time from one point to another. A complex combines several waves to represent a coordinated event, most notably the QRS complex, which reflects ventricular depolarization and the start of ventricular contraction. The T wave then represents ventricular repolarization, or relaxation. So, the term that describes a grouped set of waves that together signal a single electrical event is the complex.

Groups of waves on an ECG form a complex, which names a single electrical event. A wave is one deflection, like the P, QRS, or T. A segment is a flat stretch between waves, and an interval is a span of time from one point to another. A complex combines several waves to represent a coordinated event, most notably the QRS complex, which reflects ventricular depolarization and the start of ventricular contraction. The T wave then represents ventricular repolarization, or relaxation. So, the term that describes a grouped set of waves that together signal a single electrical event is the complex.

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