Deoxygenated blood enters the heart through the Vena cavae and to the right atrium and is pumed to the right ventricle and the DO blood is carried by the pulmonary artery into the lungs for oxygenation. Then the oxygenated blood is carried by the pulmonary veins to the left atrium then left ventricle and to the aorta and all parts of the body.
In our discussion of how the heart works, we said that blood is pumped from the right side of your heart to your lungs. Just like the air you inhale moves through passageways, the blood that flows through your lungs moves through a set of branching pipes called pulmonary vessels. The biggest pipes are called pulmonary arteries; as the vessels move deeper into the lungs, they divide into smaller and smaller branches, eventually becoming a large network of very thin-walled vessels calledcapillaries. These vessels are important because they are the site of oxygen transfer from the alveoli, across the alveolar and capillary walls, into the blood. If there is trouble with the pulmonary vessels, you may have difficulty getting oxygen into the blood.