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  4. The given figure represents diagrammatic presentation of an ECG. Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/biology/ce5f72b4149b53ffb836ba7932bea86f-.png /> Which of the following letter shows the incorrect activity of heart?

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Q. The given figure represents diagrammatic presentation of an ECG. Each peak in the ECG is identified with a letter from $P$ to $T$ that corresponds to a specific electrical activity of the heart.
image
Which of the following letter shows the incorrect activity of heart?

Body Fluids and Circulation

Solution:

The contraction starts shortly after the $Q$ wave and marks the beginning of the systole.