Blood enters from the superior vena cava and then goes into the right atrium. It then goes through the tricuspid valve into the right ventricle. From the right ventricle it exits through the pulmonary valve to the pulmonary artery. Next it goes to the lungs to become oxygenated and then through the pulmonary veins into the left aorta. The blood then goes through the bicuspid valve into the left ventricle. It then exits through the aortic valve to the aorta, which then releases blood to the body.
Our heart
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