PBS 1.2.5

The left atrium receives oxygenated blood from the lungs via the pulmonary veins and pumps it into the left ventricle.

The left pulmonary vein is typically labeled as 'I' in diagrams.

After leaving the right ventricle, blood enters the pulmonary artery via the pulmonary valve to go to the lungs for oxygenation.

The superior vena cava is a large vein that carries deoxygenated blood from the upper body to the right atrium.

The pulmonary veins carry oxygenated blood from the lungs back to the left atrium of the heart.

Blood flows from the right ventricle into the pulmonary artery through the pulmonary valve.

The pulmonary valve prevents backflow of blood into the right ventricle after it has been pumped into the pulmonary artery.

The left atrium receives oxygenated blood.

The right atrium receives deoxygenated blood from the body via the superior and inferior vena cavae.

The pulmonary artery carries deoxygenated blood from the heart to the lungs, while the pulmonary vein carries oxygenated blood from the lungs back to the heart.