What does P-wave represent in ECG?

End of systole

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Contraction of both atria

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Initiation of ventricular contraction

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Beginning of systole

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Solution

The correct option is B Contraction of both atria
In an ECG, there are five consecutive waves: P, Q, R, S and T.
P wave represents atrial depolarisation which leads to contraction of both atria.
QRS complex represents ventricular depolarisation which initiates contraction of ventricles.
T wave represents ventricular repolarisation. It represents the return of ventricles from excited state to normal state.
So, the correct answer is 'Contraction of both atria'.

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