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Page 1

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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…

Page 2

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Blood goes back to the lungs to become oxygenated again


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