Which blood vessel is the largest in the human body?

The aorta is the main artery that carries oxygen-rich blood from the heart to the rest of the body. It begins at the left ventricle and arches upward before descending through the chest and abdomen. In adults, the aorta is usually about 2 to 3 centimeters wide at its root. Because it distributes blood to nearly every organ, it is one of the most important vessels in circulation.