What causes a heartbeat?
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Texas Cardiac Arrhythmia Institute answered:A heartbeat occurs from the contraction of the heart’s upper chambers, called the atria, followed by a contraction of its lower chambers, called the ventricles. The contractions push the blood through the heart and into the lungs and rest of the body.A heartbeat occurs from the contraction of the heart’s upper chambers, called the atria, followed by a contraction of its lower chambers, called the ventricles. The contractions push the blood through the heart and into the lungs and... More
