The term 'heart artery' refers to the AORTA, which is the largest artery in the human body. It originates from the left ventricle of the heart and carries oxygen-rich blood to the rest of the body. The AORTA is divided into ascending, arch, and descending sections, and its diameter can range from 2 to 4 cm. The AORTA is an important part of the cardiovascular system, as it is responsible for supplying oxygenated blood to the organs and tissues of the body.