The lumen is the hollow opening or the space inside the blood vessel. Artery Vein Capillary Function Carry blood away from the heart (usually oxygenated blood, except for the pulmonary artery ...

This is called a graft. When an artery is needed it's usually taken from the patient's chest during the by-pass surgery itself. When a vein is required, surgeons normally tap the patient's leg.

Women who are pregnant. People who have an abnormal passageway between an artery and vein (arteriovenous fistula) in the leg. Vein ligation and stripping removes varicose veins successfully in 80 out ...