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The sinoatrial (SA) node is located in the right atrial wall near the opening of the superior vena cava. It generates rhythmic electrical impulses and acts as the natural pacemaker of the heart.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Regulation and Disorders of Circulatory System
Bradycardia is a condition where the heart rate is slower than normal due to SA node dysfunction.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Regulation and Disorders of Circulatory System
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