Veins have thinner walls than arteries as they run beneath decrease tension. Additionally they comprise valves that avert backflow, ensuring that blood returns proficiently to the center. Like arteries, veins encompass 3 levels but with less muscle mass and elastic tissue. Respiratory method. As blood flows throughout the capillaries from the https://www.sgvascularctr.com/a-complete-guide-to-aortic-aneurysm-in-singapore/