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2 December, 10:00

During which portion of the electrocardiogram do the atria contract

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  1. 2 December, 12:54
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    Answer;

    - P-R interval

    Explanation;

    -P-R interval is the period of time from the onset of the P wave to the beginning of the QRS complex. This period normally ranges from 0.12 to 0.20 seconds in duration.

    -The P-R interval represents the time between the onset of atrial depolarization and the onset of ventricular depolarization. A prolonged PR interval indicates delayed conduction of the sino-atrial, or SA, nodal impulse to the ventricles and is called first-degree AV block. A short PR interval can be seen when the AV node delay is bypassed.
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