In the coronary circuit, the myocardium performs the coordinated contractions that pump blood out of the ventricles. These contractions are the

The myocardium is the muscular tissue of the heart, and its coordinated contractions make up a heartbeat. The coronary arteries supply blood to the heart muscle, the heart rate is how often the heart beats, and the aorta carries blood away from the heart. So the contractions are the heartbeat.

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