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• Deoxygenated blood from the rest of the body enters the heart through the vena cava .
• Blood enters the right atrium, then through tricuspid valve into right ventricle.
• Then via semi-lunar valve to the pulmonary artery to the lungs.
• Oxygenated blood from the lungs enters the heart through pulmonary vein.
• It enters the left atrium of the heart, then through bicuspid valve into left ventricle.
• Then via semi-lunar valves to aorta which takes oxygenated blood round the body.