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  4. P wave in ECG occurs before the

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Q. $P$ wave in ECG occurs before the

Haryana PMTHaryana PMT 2011

Solution:

$P$ wave is produced by activation of SA node. In fact it represents atrial contraction. It is the first upward deflection caused by the passage of the action current over the auricles. Its average duration is about $0.1$ second.