The AORTA is the biggest blood vessel in the human body. It is a major artery that carries oxygen-rich blood from the heart to the rest of the body. The AORTA is the largest artery in the body and is about the diameter of a garden hose. It is divided into the ascending AORTA, the arch of the AORTA, and the descending AORTA. The AORTA is responsible for supplying oxygenated blood to the entire body, including the brain, heart, and other organs.