Q:

The electrocardiogram chart is a graph. What is plotted against the vertical axis?

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The electrocardiogram chart is a graph. What is plotted against the vertical axis?


  1. The voltage produced by the myocardial cells.
  2. The elapsed time.
  3. The rate of contraction of the myocardium.
  4. The current fl owing in the conduction system of the heart.

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A: The ECG records the voltage produced by the heart muscle measured at the body surface.

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