The primary artery is the AORTA, which is a large blood vessel that carries oxygen-rich blood from the heart to the rest of the body. It is the largest artery in the body and is located in the chest cavity. The AORTA is divided into ascending, arch, and descending sections, and it branches off to supply blood to the head, neck, arms, and other organs. It is an important part of the cardiovascular system and helps to maintain healthy blood pressure and circulation.