How does your blood turn from deoxygenated to oxygenated?
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The blood that is returned to the right atrium is deoxygenated, then passed into the right ventricle to be pumped through the pulmonary artery to the lungs for reoxygenation and removal of carbon dioxide. The left atrium receives newly-oxygenated blood from the lungs through the pulmonary veins.
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The right atrium pumps blood to the right ventricle which then pumps the blood into the lungs where it is oxygenated and then returns to the left atrium. From the left atrium blood is next pumped into the left ventricle, the strongest pumping chamber of the heart, which then pumps the blood out of the heart, into the aorta from which it flows to the rest of the body.
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