P wave of ECG occurs before the:

Question

P wave of ECG occurs before the: (A) onset of ventricular ejection (B) end of atrial contraction (C) begining of atrial contraction (D) none of the above

Tardigrade Admin · Accepted Answer

P wave of ECG occurs before the beginning of atrial contraction (depolarization of atria). It is the first upward deflection caused by the passage of the action current over the auricles. Its average duration is about 0.1 sec.

Q. P wave of ECG occurs before the:

onset of ventricular ejection

end of atrial contraction

begining of atrial contraction

none of the above

P wave of ECG occurs before the beginning of atrial contraction (depolarization of atria). It is the first upward deflection caused by the passage of the action current over the auricles. Its average duration is about 0.1 sec.