EVERYDAY SCIENCE

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: -In arteries there is a lot more pressure, due to the force of blood being pumped outwards from the heart, so they need thicker walls in order to prevent bursting. In veins the pressure is much less, and so thinner walls are present.

Detailed explanation-3: -Arteries experience a pressure wave as blood is pumped from the heart. This can be felt as a “pulse.” Because of this pressure the walls of arteries are much thicker than those of veins.

Detailed explanation-4: -Arteries have thick walls with muscle tissue. Veins have thinner walls and use valves to keep your blood flowing.

Detailed explanation-5: -Tunica interna: The inner layer and composed of elastic membrane and endothelium. The middle layer i.e. Tunica media is thin in veins and thick in arteries.