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pulmonary arteriovenous fistula
The pulmonary artery and pulmonary vein originates in the heart. What is different about them is that the pulmonary artery carries deoxygenated blood (blood without oxygen) as supposed to other arteries, which carry oxygenated blood. And the pulmonary vein carries oxygenated blood unlike other veins, which carry deoxygenated blood.
Pulmonary veins derive from the lungs. And reside in the cardiovascular system.
Vena Cava has valves, if im not wrong, but pulmonary veins definitely do not have valves.
The pulmonary veins are the only veins in the body that carry oxygenated blood. Like all veins the blood in the pulmonary veins travel toward the heart.
Pulmonary veins
I believe it has less carbon dioxide than other veins.
I believe it has less carbon dioxide than other veins.
The pulmonary vein is the only vein that carries oxygenated blood. Arteries are the major oxygenated blood carriers (away from the heart) veins carry blood back to the heart. The pulmonary vein returns blood from the lungs to be distributed by the heart and arteries.
The pulmonary veins are veins which carry oxygenated blood (unlike most veins) back from the lungs to the left atrium of the heart.
Pulmonary Arteries lead from the heart to the lungs. Systemic arteries go everywhere else. Consequently, the pulmonary arteries are usually slightly smaller and thinner. There is also less of them.
Arteries carry blood away from the hart, they have the highest blood pressure and amount of oxygen. (except for pulmonary arteries) Capillaries carry blood from arteries to veins. They are a single cell wide and exchange chemicals with nearby tissue. Veins carry blood towards the heart, and have the lowest amount of oxygen. (except for pulmonary veins)