P wave in ECG occurs before the

Question

P wave in ECG occurs before the (A) onset of ventricular ejection (B) end of arterial contraction (C) beginning of atrial contraction (D) None of these

Tardigrade Admin · Accepted Answer

P wave is produced by activation of SA node. In fact it represents atrial contraction. It is the first upward deflection caused by the passage of the action current over the auricles. Its average duration is about 0.1 second.

Q. $P$ wave in ECG occurs before the

onset of ventricular ejection

end of arterial contraction

beginning of atrial contraction

None of these

$P$ wave is produced by activation of SA node. In fact it represents atrial contraction. It is the first upward deflection caused by the passage of the action current over the auricles. Its average duration is about $0.1$ second.

Q. P wave in ECG occurs before the