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Which of the following ECG waves indicates that the ventricles are about to contract?
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18. The Heart
Electrocardiogram (ECG)
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Which wave on the ECG shows the depolarization of the ventricles?
A
QRS complex
B
P wave
C
T wave
D
U wave
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Understand the basic components of an ECG (Electrocardiogram) which records the electrical activity of the heart.
Identify the different waves on an ECG: P wave, QRS complex, T wave, and sometimes U wave.
Recognize that the P wave represents atrial depolarization, which is the electrical activity that leads to the contraction of the atria.
Learn that the QRS complex represents ventricular depolarization, which is the electrical activity that leads to the contraction of the ventricles.
Note that the T wave represents ventricular repolarization, which is the process of the ventricles returning to their resting state after contraction.
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