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In page Atrial septostomy:
"In a normal heart, oxygen-depleted blood ("blue") is pumped from the right side of the heart, through the pulmonary artery, to the lungs where it is oxygenated. This is the pulmonary circulation part of blood flow. The oxygen-rich ("red") blood then returns to the left heart, via the pulmonary veins, and is pumped through the aorta to the rest of the body, including the heart muscle itself. This is the systemic circulation part of blood flow, the other loop of an interconnected normal cardio-pulmonary system.[citation needed]
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