In the surgical procedure called a bypass graft, a vessel is removed from a patient and used to make a vascular bridge that bypasses one of that patient's blocked arteries. A common vessel used for this procedure is the greater saphenous vein. Why do you think a surgeon might use the greater saphenous vein instead of the femoral vein or a large artery? 2. Predict what might happen if the plastic fibers in a blood vessel's wall were defective. Would such a condition be more problematic for arteries or for veins? Explain.