A blood vessel that transports blood from body tissues and organs to the heart. transporting blood that has typically lost its oxygen toward the heart.
Arteries have substantial walls compared to veins' thin walls.
Similar to arteries, veins have three layers in their walls.
There is less connective tissue and smooth muscle despite the presence of all the layers.
This results in vein walls being thinner than artery walls, which is related to the fact that blood in veins experiences lower pressure than blood in arteries.