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Which part of an electrocardiogram corresponds to the contraction of the atria?
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18. The Heart
Electrocardiogram (ECG)
Multiple Choice
What part of an electrocardiogram (ECG) represents ventricular repolarization?
A
U wave
B
T wave
C
QRS complex
D
P wave
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Understand the components of an electrocardiogram (ECG): An ECG is a graphical representation of the electrical activity of the heart. It consists of several waves, each representing different phases of the cardiac cycle.
Identify the P wave: The P wave represents atrial depolarization, which is the electrical activity associated with the contraction of the atria.
Identify the QRS complex: The QRS complex represents ventricular depolarization, which is the electrical activity associated with the contraction of the ventricles.
Identify the T wave: The T wave represents ventricular repolarization, which is the process of the ventricles returning to their resting state after contraction.
Consider the U wave: The U wave is sometimes seen following the T wave and is not always present. It is thought to represent repolarization of the Purkinje fibers or other parts of the heart's conduction system, but it is not the primary indicator of ventricular repolarization.
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