Left atrium, Left ventricle, Right ventricle, Right atrium, Vena cava carrying deoxygenated blood from the body cells (high in CO2 from respiration), Pulmonary artery (carrying deoxygenated blood away from the heart to the lungs), Pulmonary vein (veins go in to the heart) carrying oxygenated blood, Aorta carrying oxygenated blood high in oxygen to the body cells for use in respiration..

Flow labelled - structure and function of the heart

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