The basic pattern of blood flow from the lungs to the rest of the body is:
pulmonary vein; left ventricle; left atrium; vena cava.
pulmonary vein; left ventricle; left atrium; vena cava.
pulmonary artery; left atrium; left ventricle; aorta.
pulmonary artery; left atrium; left ventricle; aorta.
vena cava; aorta; right ventricle; right atrium.
vena cava; aorta; right ventricle; right atrium.
pulmonary vein; left atrium; left ventricle; aorta.