Heart's coronary blood vessels. Artwork of the external anatomy of a human heart, seen from the front. The surface blood vessels are the coronary arteries (red) and veins (blue), bringing oxygenated blood to the heart and removing deoxygenated blood. Across top are parts of the major blood vessels that bring blood to and from the heart, along with multiple branches of the vessels taking blood to and from the lungs. Left to right, the major blood vessels are the vena cava, the aorta (arch at upper centre), the pulmonary artery, and the pulmonary vein (only partially seen).