Multiple choice

The P wave of the electrocardiogram is associated with

  1. contraction of atria

  2. depolarisation of atrial muscular tissues

  3. contraction of ventricles

  4. repolarisation of S–A node
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The P wave in an ECG represents the depolarization of atrial muscle tissue, which is the electrical event that precedes atrial contraction. Option A incorrectly states it represents contraction itself - the ECG records electrical activity, not mechanical contraction. The QRS complex represents ventricular depolarization.

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