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#vena cava #blue blood #heart input #venous return #deoxygenated blood #right atrium #blood circulation

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#vein #deoxygenated blood #venous return

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#blood circulation #venous return #deoxygenated blood #wolf doolb #cardiovascular cycle #vein

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#superior vena cava #inferior vena cava #blood input #venous return #systemic circulation #great vessels