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The heart is a beating muscle that continually pumps blood to the rest of the body. What we commonly call a heartbeat is actually the rhythmic contraction of the heart's four chambers. Each heartbeat is stimulated by electrical signals that travel through a specific nerve pathway in the heart. These signals can be tracked and recorded by an electrocardiogram, or EKG.
The heart's electrical signal begins at the sino-atrial node, or SA node, which is ... more
