In an electrocardiogram, the P wave represents
- A. repolarisation of the ventricles
- B. contraction of the ventricles
- C. depolarisation and contraction of the atria
- D. closure of the heart valves
Explanation
The P wave records the spread of excitation across the atria, which then contract. The QRS complex shows ventricular depolarisation and the T wave ventricular recovery, so each deflection maps to a specific electrical event.