Answer:
Oxygenated; left atrium
Explanation:
The pulmonary vein is the only vein that carries oxygenated blood. This is because it carries blood from the lungs to the heart, after oxygenation and de-carbonation, while other vein carries deoxygenated blood from tissues to the heart via the venacava vein.
After the left atrium receives the oxygenated blood, it channels it to the left ventricle that pumps the blood to the tissues via the aorta artery.
