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59. What is an electrocardiogram (ECG or EKG)? A. It represents the recording of the mechanical activity of the heart. B. It is the graphic recording of the electrical activity of the brain. C. It represents the sum of the electrical activities of all cardiac muscle fibers, recorded on the surface of the body. D. It is a blood pressure measurement. E. It is a record of the speed of blood circulation in the veins and arteries.
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