Certified EKG Technician (CET) Practice Exam 2025 – All-in-One Guide to Exam Success!

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What does the QRS complex signify in an EKG?

Atrial repolarization

Ventricular repolarization

Ventricular depolarization

The QRS complex is a crucial component of the electrocardiogram (EKG or ECG) and signifies ventricular depolarization. This phase occurs when the ventricles of the heart become electrically stimulated, leading to their contraction and the subsequent pumping of blood out of the heart. The complex is characterized by a rapid series of deflections that represent the electrical impulses traveling through the ventricular muscle.

Ventricular depolarization is vital for effective heart function, as it initiates the sequence that leads to the ejection of blood. Understanding the QRS complex's role is essential for interpreting an EKG, as it reflects the heart's electrical activity during a pivotal part of the cardiac cycle. Recognizing this will aid in diagnosing various cardiac conditions that may alter this phase of the heart's electrical activity.

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Electrical inactivity of the heart

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