Cardiovascular System · NEET PG Preparation Physiology
On an electrocardiogram (ECG), the PR interval represents which of the following electrophysiological events?
Practice question from Cardiovascular System (NEET PG Preparation Physiology), with the correct answer and a step-by-step solution.
easy · MCQ · Q-F045E9
On an electrocardiogram (ECG), the PR interval represents which of the following electrophysiological events?
- A.Time taken for atrial depolarization only
- B.Time from the onset of atrial depolarization to the onset of ventricular depolarizationCorrect answer
- C.Total duration of ventricular depolarization and repolarization
- D.Delay of impulse conduction through the bundle of His alone
Solution
The PR interval extends from the beginning of the P wave (onset of atrial depolarization) to the beginning of the QRS complex (onset of ventricular depolarization). It includes the AV nodal delay, which allows time for the atria to empty into the ventricles.
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