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From there, the blood leaves the heart through the aorta to be distributed throughout the body. Blood enters the heart through the superior and inferior venae cavae into the right atrium. This blood then flows through the right atrioventricular valve to the right ventricle.
Your heart is a marvel of nature that pumps life-giving, oxygen-rich blood throughout the body for use by every cell. Upon use by the body, the heart returns the oxygen-depleted blood to the lungs, where it receives more oxygen, to again be pumped throughout the body. The pumping action of the heart is controlled by coordinated electrical signals, or impulses, in the heart. Heart arrhythmias are irregular heartbeats caused by irregular electrical impulses in the heart. Atrial fibrillation is the most common of these heart or cardiac arrhythmias.