Arteries are most accurately defined as blood vessels that arteries are most accurately defined as blood vessels that carry blood toward the heart carry deoxygenated blood carry blood away from the heart carry highly oxygenated blood

The answer would be: carry blood away from the heart 

Arteries carry blood away from the heart which makes it sturdy enough to withstand the high pressure. That is why arteries is a strong, thick and flexible blood vessel.
Not all arteries carry highly oxygenated blood. Pulmonary arteries carry deoxygenated blood from the right ventricle into the lungs. 

Generally travels west to east but often shifts to north and south