What are arteriers?

Answer 1

arteries are blood vessels that are part of the system carrying blood under pressure from the heart to the rest of the body

-OR-Arteries are blood vessels that carry oxygenated blood out to the body/lungs. They are the largest form of vessel.

In other words Arteries are blood vessels that carry rich blood away from the heart throughout the body. Arteries send rich blood away throughout the cells.