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(D) The $SA$ node (Sinoatrial node) is a specialized bundle of cardiac muscle fibers located in the wall of the right atrium.Specifically,it is situat

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Upper lateral wall of the right atrium

Vedclass · Answer

(D) The $SA$ node (Sinoatrial node) is a specialized bundle of cardiac muscle fibers located in the wall of the right atrium.Specifically,it is situated in the upper lateral wall of the right atrium,near the opening of the superior vena cava.It acts as the natural pacemaker of the heart,initiating the electrical impulses that lead to cardiac contraction.

The $SA$ node is located in

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