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Anatomy
A 35-year-old female is admitted to the emergency department because of cardiac arrhythmia. ECG examination reveals that the patient suffers from atrial fibrillation. Where is the mass of specialized conducting tissue that initiates the cardiac cycle located?
At the junction of the coronary sinus and the right atrium
At the junction of the inferior vena cava and the right atrium
At the junction of the superior vena cava and the right atrium
Between the left and right atria
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