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wrote...
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A year ago
Ventricular depolarization is represented by the
 
 QRS complex
  U wave
  P wave
  PR interval
  ST segment
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wrote...
A year ago
QRS complex

Rationale: The QRS complex represents ventricular contraction; the P wave always represents the beginning of the cardiac cycle when the atria contract. The PR interval and ST segments are measurements.
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