What is Pulmonary Artery? It is a large artery that originates from the right ventricle of the heart and goes to the lungs. What is Artery? What is the pulmonary artery? The heart sends blood from the right ventricle to the lungs through the pulmonary artery. In the lungs, blood is enriched with oxygen and discharged with carbon dioxide. Then, oxygen-rich blood returns to the left atrium of the heart through the veins. This cycle is called the pulmonary circulation, and the gas in the lungs...