Which event does the T wave reflect?

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Prepare for the PLTW Biomedical Science Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

Which event does the T wave reflect?

Explanation:
The T wave on an ECG reflects ventricular repolarization—the ventricles resetting and relaxing after contracting. After the P wave shows atrial depolarization (atrial contraction) and the QRS complex shows ventricular depolarization (ventricular contraction), the ventricles return to their resting electrical state, which is what the T wave captures. So the event is the ventricles relaxing. The other statements describe different timing or chambers: atrial contraction corresponds to the P wave, ventricular contraction to the QRS complex, and atrial relaxation isn’t seen as a separate wave because atrial repolarization occurs during the QRS and is masked.

The T wave on an ECG reflects ventricular repolarization—the ventricles resetting and relaxing after contracting. After the P wave shows atrial depolarization (atrial contraction) and the QRS complex shows ventricular depolarization (ventricular contraction), the ventricles return to their resting electrical state, which is what the T wave captures. So the event is the ventricles relaxing. The other statements describe different timing or chambers: atrial contraction corresponds to the P wave, ventricular contraction to the QRS complex, and atrial relaxation isn’t seen as a separate wave because atrial repolarization occurs during the QRS and is masked.

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