Which of the following represents the correct events of a cardiac cycle beginning from the firing of an impulse from the pacemaker of the heart?

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When the SA node fires impulse, it reaches the atria and they contract for 0.1 sec. During this interval, the impulse has not reached the ventricles so they are still relaxing. After 0.1 seconds, the impulse reaches the ventricles and they contract for 0.3 seconds. Atria are now relaxing during this phase. After this ventricles will relax. Thus the correct graph is C

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