The P wave represents which of the following?
a. Atrial contraction
b. Atrial depolarization
c. Sinus node discharge
d. Ventricular contraction
B
The P wave is an electrical event and represents atrial depolarization. Atrial contraction should accompany the P wave but does not always. The sinus node discharge is too faint to be recorded on the surface electrocardiogram. Ventricular contraction usually accompanies the QRS complex.
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