what is the role of Pulmonary artery and Pulmonary vein
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The Anatomy of the Pulmonary Artery
By Craig Weber, MDUpdated May 17, 2019

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The pulmonary artery is a blood vessel which delivers deoxygenated blood to the lungs. Like all arteries, the pulmonary artery pumps blood away from the heart—in contrast to veins, which deliver blood to the heart. However, unlike most arteries, which carry blood with a relatively high oxygen content, the pulmonary artery transports blood whose oxygen content is relatively low. Blood with little oxygen content is delivered to the lungs via the pulmonary artery. In the lungs, the blood takes on oxygen and then is pumped back to the heart to be circulated throughout the rest of the body.
Answer:
The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs.
Pulmonary veins are responsible for carrying oxygenated blood from the lungs back to the left atrium of the heart.