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...
The blood in the pulmonary arteries is heading towards the lungs to be oxygenated. The blood in the pulmonary veins is freshly oxygenated, and is heading to the heart to be pumped to the various...
Yes, the wall of the pulmonary artery contains a layer of smooth muscle to deal with the high pressure from the heart, and to help push the blood along.