Arteries appear to be subclassified, at least in anatomical references: The heart pumps blood out through one main artery called the dorsal aorta. The main artery then divides and branches out into many smaller arteries so that each region of your body has its own system of arteries supplying it with fresh, oxygen-rich blood. These are of course in contradistinction to ' veins ', which bring the blood back to the heart.
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