Advanced Dental Admission Test (ADAT)

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Prepare for the Advanced Dental Admission Test. Study with flashcards and multiple choice questions, with hints and explanations provided for each question. Strengthen your readiness for success!

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What does the T Wave on an ECG represent?

Atrial depolarization
Ventricular depolarization
Repolarization of ventricles
Heart rate

The correct answer is: Repolarization of ventricles

The T Wave on an electrocardiogram (ECG) represents the repolarization of the ventricles. This phase is crucial because after the ventricles contract to pump blood throughout the body, they need to reset their electrical state in preparation for the next contraction. The T Wave indicates this recovery phase, where the myocardial cells undergo a process to restore the resting membrane potential. Proper repolarization is essential for the heart to function effectively and maintain a regular heartbeat. While the other options relate to different aspects of the cardiac cycle, they do not specifically describe the T Wave. Atrial depolarization is represented by the P Wave, and ventricular depolarization is depicted by the QRS complex. Heart rate is an overall measure influenced by the entire cardiac cycle but not directly linked to the T Wave itself. Thus, recognizing the T Wave's role in ventricular repolarization is key in understanding an ECG's interpretation.