NREMT Paramedic

Answer: A -The pulmonary vein carries oxygen-rich blood from the lungs to the left atrium. Veins, by definition, carry blood towards the heart, and arteries away. The usual association of oxygenated blood with arteries and oxygen-poor blood with veins is reversed in the case of pulmonary vasculature. Since oxygen-poor blood returns to the heart through veins, it is pumped away from the heart and into the lungs by the pulmonary artery, and oxygenated blood is carried from the lungs toward the heart in the pulmonary vein.