Human circulatory system, illustration. Arteries are shown in red and veins in blue. The labelled areas down left are: the subclavian blood vessels, the superior vena cava, the brachial blood vessels, the portal vein, the renal blood vessels, the inferior vena cava, and the internal iliac blood vessels. The labelled areas down right are: the carotid arteries, the jugular veins, the aorta, the pulmonary blood vessels, the splenic blood vessels, the mesenteric arteries, and the femoral blood vessels.