Left pulmonary artery
The main pulmonary artery is responsible for transporting deoxygenated blood from the heart and into the lungs. The main artery splits into the left pulmonary artery and the right pulmonary, each of which directs the blood to the corresponding lung. These are the sole arteries in the body, along with the umbilical arteries, that transport deoxygenated blood. The umbilical arteries are located in the uterus. The pulmonary artery, or pulmonary trunk, begins from the bottom of the right ventricle of the heart. The artery is wide and short, measuring 1.2 inches wide and 2 inches long. When blood pressure increases in the right or left pulmonary artery or the main pulmonary artery, this is referred to as pulmonary hypertension and can result in symptoms such as fainting, dizziness and shortness of breath. When someone suffers from pulmonary hypertension, it can cause heart failure in the right ventricle of the heart. In other instances, it can be a consequence of other conditions such as heart disease, scleroderma or a pulmonary embolism.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Left pulmonary artery