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pulmonary vein
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X-ray image of coronary artery circulation Silhouette diagram of the human body highlighting the heart and major blood vessels, with labeled arteries in red and veins in blue to show the structure of the cardiovascular system. Diagram of the human circulatory system showing major arteries in red and veins in blue, with labeled pathways for arterial supply and venous drainage to organs including the heart, lungs, liver, kidneys, intestines, and lower limbs. Pulmonary blood vessels
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pulmonary vein

anatomy
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X-ray image of coronary artery circulation
X-ray image of coronary artery circulation Figure 13: A synchrotron X-ray image of the coronary artery circulation of a human subject taken after an intravenous injection of an iodine-based contrasting agent. The angiogram was taken at the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory, New York, U.S. A complete blockage of the right coronary artery (RCA) is seen at the position RCA-X. Other structures visualized are the aorta (AO), the left ventricle (LV), a catheter in the right atrium (CATH), pulmonary veins (PV), and the right internal mammary artery (IM).

The pulmonary veins are valveless veins that return oxygenated blood from the lungs to the heart. In humans, there are four pulmonary veins, two from each lung, that empty into the left atrium. This oxygenated blood is then pumped from the left atrium to the left ventricle and subsequently to the rest of the body. Unlike most veins that carry deoxygenated blood from the body's tissues to the right atrium, the pulmonary veins are the principal exceptions, transporting oxygenated blood from the lungs. The pulmonary circuit, which includes these veins, is essential for the human cardiovascular system.1234

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4 Britannica Sources
  1. pulmonary vein
  2. human cardiovascular system - Venous pulmonary system
  3. atrium
  4. vein

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