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EXTERNAL JUGULAR VEIN BRAIN INTERNAL JUGULAR VEIN SUBCLAVIAN VEIN SUPERIOR VENA CAVA PULMONARY ARTERY CEPHALIC VEIN LIVER PORTAL VEIN INFERIOR VENA CAVA CAPILLARY BED RENAL VEIN ILIAC VEIN FEMORAL VEIN GREAT SAPHENOUS VEIN POSTERIOR TIBIAL VEIN CIRCULATORY SYSTEM EXTERNAL CAROTID ARTERY INTERNAL CAROTID ARTERY SUBCLAVIAN ARTERY PULMONARY VEIN BRACHIAL ARTERY SPLEEN STOMACH KIDNEY SMALL INTESTINE RADIAL ARTERY INTENSTINE RECTUM ILIAC ARTERY FEMORAL ARTE ANTERIOR TIBIAL ARTERY POSTERIOR TIBIAL ARTERY iStock" Credit: kowalska-art.