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Cardiac Pacemaker - Class X

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Pacemaker is situated in the

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A
Wall of right atrium
💡 Explanation:
The actual structure that serves as the heart's primary pacemaker is called the sinoatrial node (SA node). The SA node is a little bundle of cells located in the wall of the right atrium, the small upper chamber on the right side of the heart.
Thus, the correct answer is 'Wall of right atrium.'
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