MICROANATOMY

Detailed explanation-1: -It is because arteries carry blood from the heart. They can withstand pressure because of their thick walls. Veins have thin walls due to the low pressure.

Detailed explanation-2: -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.

Detailed explanation-3: -Arteries and arterioles have relatively thick muscular walls because blood pressure in them is high and because they must adjust their diameter to maintain blood pressure and to control blood flow.

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

Detailed explanation-5: -Arteries carry blood away from the heart and veins return blood to the heart. Veins are generally larger in diameter, carry more blood volume and have thinner walls in proportion to their lumen. Arteries are smaller, have thicker walls in proportion to their lumen and carry blood under higher pressure than veins.