1. Walls of arteries are thicker than those of veins.
>The media of artery contains MORE smooth muscle and elastic fibers than does that of a vein.
2. Arterial walls contract. for this reason they may appear smaller, this is because they hold there shape better than veins. they are thick and strong. veins, when cut tend to collapse where as arteries hold there shape.
3. the endothelial wall of arteries does not contract which gives it a pleated/folded look.