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Which part of the ECG reflects the depolarization of the atria?
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18. The Heart
Electrocardiogram (ECG)
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Which of the following ECG components represents a lack of electrical activity?
A
P wave
B
T wave
C
QRS complex
D
Isoelectric line
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Understand the components of an ECG (Electrocardiogram): The ECG is a graphical representation of the electrical activity of the heart. It consists of several components, including the P wave, QRS complex, T wave, and the isoelectric line.
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 electrical activity associated with the relaxation of the ventricles.
Identify the isoelectric line: The isoelectric line is the flat, horizontal line on the ECG that represents a period of no electrical activity in the heart. It occurs between the waves and complexes, indicating a lack of electrical activity.
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