APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Veins and venules have much thinner, less muscular walls than arteries and arterioles, largely because the pressure in veins and venules is much lower. Veins may dilate to accommodate increased blood volume. If a blood vessel breaks, tears, or is cut, blood leaks out, causing bleeding.

Detailed explanation-2: -Veins are thin-walled and are less elastic. This feature permits the veins to hold a very high percentage of the blood in circulation.

Detailed explanation-3: -Since the blood pumped from the heart into the arteries flows at higher pressure than the blood in veins, hence arteries need to have thicker walls or else the high blood pressure might cause them to burst.