Which statement about the atrial depolarization wave is TRUE?
A. The atrial depolarization wave is hidden within the QRS complex.
B. The atrial depolarization is delayed until the ventricular repolarization.
C. There is no atrial repolarization.
D. The atria contract during repolarization.
Answer: A. The atrial repolarization wave is hidden within the QRS complex.
The P wave is the first waveform of the ECG and represents the depolarization (contraction) of the atria. The atria also have a repolarization wave, but it is usually hidden within the QRS complex.
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