[citation needed] by definition, a vein is a blood vessel that carries blood to the heart, whether oxygenated or deoxygenated A groundbreaking study published in 1998 identified the pulmonary vein as the predominant trigger for. The pulmonary vein is the only vein that carries oxygenated blood from the lungs to the heart Congenital conditions can affect the number and development of pulmonary veins, sometimes requiring surgery. It carries blood from the lungs back to the left atrium All other veins in the human body, including the vena cavae, carry deoxygenated blood back to the heart
The aorta is the largest artery in the body and branches immediately from the left ventricle, carrying freshly oxygenated blood to the rest of the body. Pulmonary veins are unique because they are the only veins that carry oxygenated blood The pulmonary vein carries oxygenated blood from the lungs to the left atrium of the heart after the blood has been oxygenated in the lungs during gas exchange This is a unique feature of the pulmonary vein, distinguishing it from other veins in the body Drains blood from the gallbladder and carries deoxygenated blood. These veins are unique in that, unlike other veins of the body which transport deoxygenated blood, the pulmonary veins carry oxygenated blood
