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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.
It's pretty amazing to watch the flow of blood. To see how blood flows through the heart, please click here to see an animation of the cardiac process. Here is a human heart diagram showing a side view of the heart. You can see the different atrium and ventricles in the picture.