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A 48-year-old female comes into the ER with chest pain. An electrocardiogram (EKG) shows a heart beat of this individual in Image A. The QR segment best correlates with what part of the action potential of the ventricular myocyte shown in Image B?
Phase 0, which is primarily characterized by sodium influx
Phase 0, which is primarily characterized by potassium efflux
Phase 1, which is primarily characterized by potassium and chloride efflux
Phase 1, which is primarily characterized by calcium efflux
Phase 3, which is primarily characterized by potassium efflux
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