<P> The pulmonary arteries carry deoxygenated blood to the lungs , where carbon dioxide is released and oxygen is picked up during respiration . Arteries are further divided into very fine capillaries which are extremely thin - walled . The pulmonary vein returns oxygenated blood to the left atrium of the heart . </P>
where does blood go when it leaves the pulmonary artery
The pulmonary vein