The largest artery in the human body is the aorta, which connects directly to the heart’s left ventricle. There are no arteries inside the heart, but there are many on the exterior of the heart, called coronary arteries. Coronary arteries bring blood directly to the tissues of the heart.
The largest coronary arteries are the left main and right coronary arteries. The left main splits into the left anterior descending and the circumflex artery. In a normal healthy artery, its size is directly proportional to the amount of blood that it transports. The larger an artery, the more blood it is moving through the body.
Arteries can become plugged due to calcium or enlarge when an artery segment weakens and expands. Blockage of the coronary arteries can be serious. Smoking, lack of exercise and genetics all can impact the health of coronary arteries as well as overall heart health. Quitting smoking, regular exercise, eating healthy and regular doctor visits can reduce the chances for negative heart events.
Once blood has been transported throughout the body to organs and tissue, it needs to return to the heart so it can be sent through the body again. The vessels that return blood to the heart are called veins. The largest veins in the body are the vena cava, which connect to the right atrium of the heart.