I believe that most of us have learned that our heart has its own electricity. Usually this electricity comes from the Sino Atrial Node and the Electricity travels tho the different areas creating a contraction of the heart.

By looking at the electrical activity, a trained person in most cases a doctor can see if something is wrong with the heart.

This can be done by the use of an Electro Cardiogram.

Shown below is a normal ECG reading.

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