Hello Bailavis, It would be not be fully correct to say that Arteries are the most important veins in our body. Actually arteries and veins are different entities of our body, although their function is same i.e. carrying blood.
Arteries carry the pure blood and veins carry the impure blood so they are given different names. They both carry the blood to the heart. Veins bring the impure or De-oxygenated blood from all parts of the body and pumps in the heart. And arteries take the pure blood or oxygenated blood from the heart to different parts of our body. If due to any reason heart is deprived of blood due to malfunctioning of either arteries or veins, it starts damaging.