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In a standard ECG

1. The end of T-wave marks the begining of systole
2. The end of T-wave marks the end of systole
3. The end of P-wave marks the end of systole
4. The end of \( Q \) -wave marks the end of systole

Correct answer: The end of T-wave marks the end of systole

Solution

The T wave represents ventricular repolarization, and mechanical systole ends shortly after this electrical recovery is complete. Therefore, the end of the T wave is taken as the end of systole in a standard ECG interpretation.

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