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Veins brings blood into the heart.
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Blood is pumped through the veins into the Vena Cava by the Superior & Inferior openings.
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After passing throught the Vena Cava, blood is then pumped into the right atrium.
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After flowing through the right atrium, blood then flows to the Tricuspid Valve.
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Under the Tricuspid Valve
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After traveling through the right ventricle, blood flows up to the Pulmonary Valve.
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When coming out of the Pulmonary Valve, blood then travels out of the heart to the lungs by the Pulmonary Artery.
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Blood travles into the lungs where oxygen and carbon dioxide are exchanged.
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Oxygenated blood flows from the lungs through the Pulmonary Veins.
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After goin through the Pulmonary Veins, oxygenated blood arrives at the Left Atrium.
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Coming from the Left Atrium, oxygenated blood flows down to the mitral valve.
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After flowing to the mitral valve, blood then flows to the Left Ventricle, which is under the mitral valve.
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Oxygenated blood flows up into the Aortic Valve.
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After being pumped from the Aortic Valve, blood flows to the Aorta where it leaves the heart. After blood leaves the heart it travels both to the upper body & the lower body.
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After leaving the Aorta, blood flows all over the body to help it function etc.