Superior and Inferior vena cavas → Right atrium → Tricuspid valve → Right ventricle → Pulmonary valve → Pulmonary artery → Lungs → Pulmonary veins → Left atrium → Mitral valve → Left ventricle → Aortic valve → Aorta → Systemic circulation

Superior and Inferior vena cavas → Right atrium → Mitral valve → Right ventricle → Pulmonary valve → Pulmonary artery → Lungs → Pulmonary veins → Left atrium → Tricuspid valve → Left ventricle → Aortic valve → Aorta → Systemic circulation

Superior and Inferior vena cavas → Right atrium → Tricuspid valve → Right ventricle → Pulmonary valve → Pulmonary veins→ Lungs → Pulmonary artery → Left atrium → Mitral valve → Left ventricle → Aortic valve → Aorta → Systemic circulation

Superior and Inferior vena cavas → Right atrium → Tricuspid valve → Right ventricle → Aortic valve → Pulmonary veins→ Lungs → Pulmonary artery → Left atrium → Mitral valve → Left ventricle → Pulmonary valve → Aorta → Systemic circulation