What makes these blood vessels unusual is that the pulmonary artery carries deoxygenated blood (instead of oxygenated), and the pulmonary vein transports oxygenated blood, not oxygen-poor.
An artery is any vessel taking blood away from the heart, irrespective of whether it carries oxygenated or deoxygenated blood. The pulmonary arteries take deoxygenated blood away from the right...
The pulmonary veins are the only veins in the body that carry OXYGENATED blood (from the lungs to the left atrium), and the pulmonary arteries are the only arteries in the body that carry...