Question

What name is given to the graphic recording of the electrical changes in the heart ?

Answer 1

Electrocardiography
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The record, which is called an electrocardiogram (ECG or EKG), shows the series of waves that relate to the electrical impulses which occur during each beat of the heart.
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Answer 2

The name given to the graphical recording of the electrical changes in heart is Electrocardiogram (ECG).