Which of the following waves of ECG are correctly paired with their events ?

Options

A. P wave - depolarisation of atria
B. QRS complex - Repolarisation of Ventricles
C. T wave - start of systole
D. T wave - end of diastole

Answer

To solve the question regarding which waves of the ECG are correctly paired with their events, we will analyze each wave and its corresponding event step by step.

### Step 1: Understand the ECG Waves
The ECG (electrocardiogram) consists of several waves, primarily the P wave, QRS complex, and T wave. Each of these waves corresponds to specific electrical events in the heart.

### Step 2: Analyze the P Wave
- **P Wave**: This wave represents the depolarization of the atria.
- **Event**: Correctly paired with "Atrial depolarization."

### Step 3: Analyze the QRS Complex
- **QRS Complex**: This complex represents the depolarization of the ventricles.
- **Event**: The statement provided mentions "repolarization of ventricles," which is incorrect. The correct event is "Ventricular depolarization."

### Step 4: Analyze the T Wave
- **T Wave**: This wave represents the repolarization of the ventricles.
- **Event**: The statements provided mention "start of systole" and "end of diastole," both of which are incorrect. The correct event is "Ventricular repolarization," which marks the end of systole.

### Step 5: Conclusion
From the analysis:
- The P wave is correctly paired with atrial depolarization.
- The QRS complex is incorrectly paired with ventricular repolarization.
- The T wave is incorrectly paired with the start of systole and end of diastole.

Thus, the only correct pairing is:
- **P Wave**: Atrial depolarization.

### Final Answer
The correct pairing of ECG waves with their events is:
- **P wave** - Atrial depolarization.

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