In an ECG, the P wave is representative of:
A. Conduction through the AV node.
B. Atrial contraction.
C. Ventricular depolarization.
D. Sinus node discharge.
Answer: B. Atrial contraction.
The P wave is the first waveform of the ECG and represents the depolarization (contraction) if the atria. The QRS complex is the second waveform and corresponds to the depolarization (contraction) of the ventricles and the main contraction of the heart. The T wave is the third waveform and represents the repolarization (relaxation) of the ventricles.
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