P wave depicts:

Atrial contraction

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Depolarization of atria

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Activation of SAN

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All of these

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Solution

The correct option is D All of these
Electrocardiogram is a graphical representation of the electrical activity of the heart during cardiac cycle.
P wave is a small upward wave caused due to atrial contraction (depolarization) because of the activation of the sinoatrial node. Signals for contraction spread throughout the atria. It lasts for a fraction of a second.

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