Final answer:
Arteries have thicker walls than veins due to the higher pressure of blood flowing through them from the heart, while veins have thinner walls and larger lumens to accommodate lower pressure.
Step-by-step explanation:
Arteries have thicker vessel walls than veins. This is because arteries are subject to higher blood pressure as they carry blood away from the heart. Arteries need to withstand the pressure of blood when it is pumped by the heart, which is why the walls of arteries are much thicker. In contrast, veins operate under lower pressure and have thinner walls with larger lumens to accommodate the lower pressure of blood flowing back to the heart. Additionally, arteries have smaller lumens compared to veins, contributing to maintaining the high pressure necessary for blood flow.
Arteries have thicker vessel walls than veins. This is because arteries carry blood away from the heart at a higher pressure compared to veins. The thicker walls, which contain smooth muscle and elastic fibers, help arteries withstand the high pressure and maintain blood flow throughout the body.