The statement 'the muscles of the ventricles depolarize' BEST describes the condition of the heart at the point indicated in the electrocardiogram. It is a representation of the heart activity.
Electrocardiogram
An electrocardiogram is a device used to check the heart's rhythm and also its electrical activity.
Sensors in the skin can detect the rhythms of the electrical signals produced by the heart when it beats.
This device (electrocardiogram) can be used to detect rhythm disturbances including atrial fibrillation and/or ventricular tachycardia.
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