Why Do Arteries Have Thick Walls. They do not have the need for the strength and elasticity of the arteries, so the walls of the veins are thin and almost floppy. The veins also consist of three layers that contain smooth muscle and connective tissue like the arteries, but in lesser amounts than the arteries.
Arteries have thicker epithelium/muscular/elastic walls compared to veins, because they have to cope with a much greater pressure.
Healthy arteries have smooth inner walls and blood flows through them easily. The left ventricle has thick walls; It is usually a result of changes within the vessel wall causing it to become thicker thickening of the wall may affect only one part of an artery or vein or result in thickening along the entire length of the vessel. The walls of the blood vessels are contracting or expanding when they respond to certain chemicals in the blood or in response to the effect of temperature but that's why we sometimes call them skeletal muscles.