Given:
Arteries have thick, elastic, muscular walls and narrow lumens, allowing them to withstand and maintain the high pressure needed to carry blood away from the heart.
Veins have thinner walls, wider lumens, and valves, enabling them to return low-pressure blood to the heart while preventing backflow.
Capillaries have walls that are only one cell thick, allowing efficient exchange of oxygen, nutrients, and wastes between the blood and body tissues.