Question

fill in the blank question
when electrodes are placed on the skin and electrical changes in the myocardium are recorded on an instrument, a reading called a(n) blank can be obtained.
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Explanation:

When electrodes are placed on the skin to record electrical changes in the myocardium, an electrocardiogram (ECG or EKG) is obtained. It is a common diagnostic tool in medicine to assess the heart's electrical activity.

Answer:

electrocardiogram (ECG or EKG)