What is the difference between vein and pulmonary vein?What is difference between artery and pulmonary artery?
Veins usually carry deoxygenated blood from various body parts to the heart. Pulmonary vein is the only vain that carry oxygenated blood from lungs to the heart.
Arteries usually carry oxygenated blood from heart to different body parts. Pulmonary artery is the only artery that carries deoxygenated blood from heart to the lungs.