The QRS complex represents

Question

BlackTom AI · Accepted Answer

When interpreting the ECG, the QRS complex timing and morphology are tied to ventricular activation. 
Option A: Depolarisation of the ventricles. This is the key feature of the QRS complex—the rapid spread of electrical activity that triggers ventricular contraction, i.e., ventricular depolarization. 
Option B: Depolarisation of the atria. Atrial depolarization is represented by the P wave, not the QRS complex, so this does not describe the QRS. 
Option C: The AV nodal delay. While there is a delay at the AV node that contributes to overall conduction time, the QRS complex specifically marks ventricular depolarization, not the nodal delay itself; the AV delay is more associated with the PR interval, not the QRS waveform. 
Option D: Repolarisation of the ventricles. Ventricular repolarization is represented by the T wave, which follows the QRS complex, so this statement would describe a later part of the ECG cycle rather than the QRS itself. 
In summary, the QRS complex is best understood as the electrical signature of ventricular depolarization, distinguishing it from atrial depolarization (P wave), AV nodal timing (reflected in intervals, not the QRS itself), and ventricular repolarization (T wave).

ANSC20001_2025_SM1 Week 5 & 6: Circulation (Example MCQs)

The QRS complex represents

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The P wave of a normal electrocardiogram coincides with which electrical events in the heart.

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The QRS complex signifies

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ANSC20001_2025_SM1 Week 5 & 6: Circulation (Example MCQs)

The QRS complex represents

查看解析

登录即可查看完整答案

类似问题

Match the number on the wave to its function. 1: Number 3 on the wave above represents… ____ 2: What do numbers 2,4, and 5 represent on the wave above? ____

Match the number on the wave to its function. 1: Number 4 on the wave above represents... ____ 2: Number 1 on the wave above represents… ____

The P wave of a normal electrocardiogram coincides with which electrical events in the heart.

Identify this cardiac rhythm:

Identify this cardiac rhythm:

The QRS complex is associated with which portion of the cardiac cycle?

Question at position 9 During which phase of the cardiac cycle does atrial repolarization “appear” in an ECG?T waveQRS complexP wave

The QRS complex signifies

更多留学生实用工具

希望你的学习变得更简单

Match the number on the wave to its function. 1: Number 3 on the wave above represents… 2: What do numbers 2,4, and 5 represent on the wave above?

Match the number on the wave to its function. 1: Number 4 on the wave above represents... 2: Number 1 on the wave above represents…