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Artwork of the internal structure of the heart. On the left, the right atrium (top cavity) & right ventriculum (bottom) receive deoxygenated blood from the body through the superior & inferior vena cava, coloured blue. From the right ventriculum the blood flows through the pulmonary arteries (not visible) to the lungs. Oxygenated blood returns to the left atrium and ventriculum and is distributed to the body through the red ascending aorta. The yellow feature at the base of the superior vena cava, embedded in blue nerve endings, is the sinuatrial node where the impulse for the heart contraction originates.