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The diagram given here is the standard ECG of a normal person. The P-wave represents the:

1. Initiation of the ventricular contraction
2. Beginning of the systole
3. End of systole
4. Contraction of both the atria

Correct answer: Contraction of both the atria

Solution

The P wave represents atrial depolarization, which triggers contraction of both atria. Ventricular contraction is associated with the QRS complex, not the P wave.

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