ECG Question #2


Use the ECG strip above to answer the following questions:

Atrial depolarization is represented by which area of the strip?


  1. P wave
    • Rationale:
  2. U wave
    • Rationale:
  3. ST segment
    • Rationale:
  4. QRS complex
    • Rationale:



The P represents the electrical impulse starting in the sinoatrial node and spreading through the atria and represents atrial depolarization. The U wave represents repolarization of the Purkinje fibers. The ST segment represents early ventricular repolarization. The QRS complex represents ventricular depolarization.

Learning Outcomes

Test Taking Tip

Video Rationale