APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Large arteries receive the highest pressure of blood flow and are thicker and more elastic to accommodate the high pressures. Smaller arteries, such as arterioles, have more smooth muscle, which contracts or relaxes to regulate blood flow to specific portions of the body.

Detailed explanation-2: -Arteries have thick walls so they can handle the high pressure and velocity that expels your blood out of your heart. Veins carry blood back to your heart from the rest of your body. The pressure of the blood returning to the heart is very low, so the walls of veins are much thinner than arteries.