What blood vessels carry blood to the heart? Away from the heart?
There are a number of differences in the structure of veins and arteries.
The most significant are:
- Thickness of walls
Arteries have a more thicker, muscular wall because blood flows at a higher pressure in them. Thick walls keep them from bursting!
But veins have thinner, less muscular wall because blood flows at a much smaller pressure. So much , that there are valves in veins that prevent blood from flowing backwards. But there aren't any in arteries.
Veins carry deoxygenated blood to the right side of the heart (except the pulmonary vein).
While arteries carry away oxygenated blood from the left side of the heart (except the pulmonary artery).