Final answer:
An ECG is a recording of heart voltages created during depolarization and repolarization, aiding in assessing heart function.
Explanation:
An electrocardiogram (ECG) is a record of the voltages created by the wave of depolarization and subsequent repolarization in the heart. Standard ECGs have 12 or more electrodes, with only three shown for clarity, and these electrodes are placed on the patient's chest to measure heart function.
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