The pacemaker of the heart is situated in:

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(D) The pacemaker of the heart is the Sinoatrial node ($SA$ node).It is a specialized patch of tissue located in the right upper corner of the right a

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The wall of the right atrium near the opening of the superior vena cava

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(D) The pacemaker of the heart is the Sinoatrial node ($SA$ node).It is a specialized patch of tissue located in the right upper corner of the right atrium.It is situated in the wall of the right atrium near the opening of the superior vena cava.Therefore, the correct option is $D$.

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