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An electrocardiogram (ECG) is used to evaluate the heart's electrical activity and muscle function. The waveform components reflect specific electrical events during a single heartbeat. Which of the following statements about these components is accurate?

1. The P wave signifies the depolarisation of the atria.
2. The QRS complex corresponds to the depolarisation and contraction of the ventricles.
3. The T wave is an upward deflection that indicates ventricular repolarisation.
4. All of the statements above are correct.

Correct answer: All of the statements above are correct.

Solution

The P wave represents atrial depolarisation, the QRS complex corresponds to ventricular depolarisation and contraction, and the T wave indicates ventricular repolarisation. All these statements are correct.

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