Final answer:
Arteries have thick and elastic walls while veins have thinner and less elastic walls. Veins have valves to prevent backflow of blood.
Step-by-step explanation:
Veins and arteries are part of the circulatory system and have structural differences.
One difference is the walls of the blood vessels. Arteries have thick and elastic walls that can withstand the high pressure of blood pumped by the heart. Veins, on the other hand, have thinner and less elastic walls, as they carry blood back to the heart at a lower pressure.
Another difference is the presence of valves. While the question specifically asks to ignore valves, it's important to note that veins have one-way valves that prevent the backflow of blood, whereas arteries lack valves.
Learn more about differences between veins and arteries