That brings the blood to the left lung and the right pulmonary artery, this artery here, that brings the blood to the right lung. Now, notice that an artery always brings blood away from our heart and this is exactly what happens within the pulmonary arteries. But in both of these arteries, we have deoxygenated blood that is being carried. So it's not always true that arteries carry oxygenated blood. So let's go to number four. In number four, we have the blood moves from these pulmonary arteries into smaller arteries and arterioles and eventually they move into the capillary system that is found in the lung.