Electrocardiography is based on the fact that ...

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Electrocardiography is based on the fact that

The heart shows electric activity which can be recorded

Beating of the heart generated microwaves that can be read by an instrument

Heart is connected to the brain which generates noticeable magnetic waves that can be graphed

The biological energy drawn by the heart from the body can be mapped on a device

Explanation:

The electrocardiogram (ECG or EKG) is a diagnostic tool that is routinely used to assess the electrical and muscular functions of the heart.
The heart is a two stage electrical pump and the heart's electrical activity can be measured by electrodes placed on the skin.
Like the spark-plug of an automobile the heart generates a number of "sparks" per minute. Each "spark" travels across a specialized electrical pathway and stimulates the muscle walls of the heart to contract and expand in a certain way