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Oxygenated blood gets to the left atrium via the pulmonary vein


The left atrium contracts (atrial systole)


Blood goes through the bicuspid valve


The left ventricle fills with blood


Left ventricle contracts (ventricular systole)


Blood goes through semi lunar valve


Blood enters aorta


Blood travels to organs to exchange gases…

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Blood goes back to the lungs to become oxygenated again


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