Multiple Choice
Which part of the ECG pattern is due to the depolarization of the ventricles?
18. The Heart
Electrocardiogram (ECG)
Multiple Choice
Which of the following waves represents ventricular depolarization in the heart's electrical conduction system?
A
T wave
B
P wave
C
QRS complex
D
U wave
Verified step by step guidance1
Understand the heart's electrical conduction system: The heart's electrical activity is represented by different waves on an electrocardiogram (ECG). Each wave corresponds to a specific phase of the cardiac cycle.
Identify the waves: The main waves on an ECG are the P wave, QRS complex, T wave, and sometimes a U wave. Each of these waves represents different electrical events in the heart.
Define ventricular depolarization: Ventricular depolarization is the process by which the ventricles of the heart prepare to contract. This is a crucial part of the cardiac cycle as it leads to the pumping of blood out of the heart.
Match the wave to the event: The QRS complex on an ECG represents ventricular depolarization. It is characterized by a rapid sequence of deflections that correspond to the depolarization of the right and left ventricles.
Differentiate from other waves: The P wave represents atrial depolarization, the T wave represents ventricular repolarization, and the U wave, when present, is less understood but may represent repolarization of the Purkinje fibers or other late repolarization events.
