Carries deoxygenated blood to the lungs.

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In the pulmonary circulation, blood that needs to be sent to the lungs travels in the pulmonary artery. It leaves the right side of the heart (the right ventricle) and carries deoxygenated blood to the lungs for gas exchange. After the lungs oxygenate the blood, it returns to the heart via the pulmonary veins. The other vessels have different roles: the aorta carries oxygen-rich blood from the heart to the body, and the vena cava brings deoxygenated blood from the body back to the heart. So the pulmonary artery is the vessel that specifically transports deoxygenated blood to the lungs.