In an electrocardiogram,the QRS complex represents the

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The QRS complex represents the depolarization of the ventricles. This occurs just before the ventricles contract, creating the main force behind blood flow in the circulatory system. The atria have already depolarized prior to the QRS complex, which is why option A is incorrect. Options B and D involve repolarization, which occurs after depolarization and the QRS complex. Option E refers to a delay in electrical conduction, which is not specifically represented by the QRS complex.

In an Electrocardiogram,the QRS Complex Represents the