The Brainliest Answer!
Veins bring back blood to heart from different parts of our body.
in order to stop the flow of blood backwards valves are present in veins.
whereas arteries are just to send blood to different parts of our body.
You may get a  doubt that blood to top parts of heart.In this case Aorta rushes blood with great force.
this allows blood to all parts of our body and we have arteries less lumen.!

3 2 3

This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Its because ............
veins bring di-oxygenated blood from all parts to blood......the force in the veins is comparatively less in arms and prevent backflow ,veins are there in veins................

1 5 1