Coloured 3D computed tomography (CT) scan of an anterior oblique view of a healthy heart and aortic arch (red). The heart is a hollow sac of muscular tissue that pumps blood around the body. The aorta, the body's main vein carries oxygenated blood from the heart to the body. Branching from the aortic arch, from right to left, are the brachiocephalic artery, the left common carotid artery and the left subclavian artery.