Cardiovascular system. Coloured magnetic resonance imaging (MRI) angiogram of the head and torso of a male patient showing a healthy cardiovascular system. At centre is the heart (red). Above it is the aortic arch, which has arteries branching off it that serve the arms, neck and head. The aorta is the body's main artery. The abdominal aorta is seen running down centre below the heart. Either side of it are the kidneys (pink) and the renal arteries that supply them. At bottom the aorta branches to serve the legs.
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