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In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?

1. S - start of systole
2. T - end of diastole
3. P - depolarisation of the atria
4. R - repolarisation of ventricles

Correct answer: P - depolarisation of the atria

Solution

The P wave on a standard ECG represents atrial depolarisation, which triggers atrial contraction. The other options are incorrect because systole/diastole are mechanical phases, and ventricular repolarisation is represented mainly by the T wave.

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