Cardiovascular System Exam Related

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What does the PR interval measure?

  • A. Time it takes for the electrical impulse to travel from the atria to the ventricles
  • B. Measurement of ventricular depolarization
  • C. Duration of ventricular repolarization
  • D. Segment representing the time between ventricular depolarization and repolarization
Correct Answer: A

Rationale: The PR interval measures the time it takes for the electrical signal to travel from the atria to the ventricles, reflecting atrial depolarization and the delay at the AV node before ventricular activation. Option A is correct as it accurately describes the PR interval. Option B is incorrect as the PR interval does not measure ventricular depolarization. Option C is incorrect as the PR interval does not represent ventricular repolarization. Option D is incorrect as it describes the QT interval, not the PR interval.