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When we inhale, the blood in the capillaries in our lungs will get the oxygen (the blood will be oxygenated) and it will go to the heart, first in the left atrium,mitral valve,left ventricle and to the aortic valve that will transport it to the different parts of body. Then, when the blood is deoxygenated, it will go to the inferior vena cava, right atrium,tricuspid valve,right ventricle, and pulmonary veins and the deoxygenated blood will go to the capillaries in our lungs and transport the carbon dioxide to the alveoli and we exhale it.
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