The pulmonary arteries are blood vessels that carry deoxygenated blood from the right ventricle of the heart to the lungs. In the lungs, carbon dioxide is exchanged for oxygen, which is essential for the body’s respiratory process. There are two main pulmonary arteries: the left pulmonary artery and the right pulmonary artery. Each artery branches off to supply blood to the corresponding lung, ensuring that both lungs receive the necessary blood flow for oxygenation. This process is crucial for maintaining healthy blood oxygen levels in the body.