Ans.
When SA node fails to generates impulse then AV node become the pace maker of the heart and generates impulse 40-60 impulse/min. So, AV node is called the reserve pacemaker of the heart.
When SA node fails to generates impulse then AV node become the pace maker of the heart and generates impulse 40-60 impulse/min. So, AV node is called the reserve pacemaker of the heart.
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