Path of blood flow through the heart starting at the vena cava:

• Blood travels from the superior and inferior vena cava, • right atrium, • tricuspid valve, • right ventricle, • pulmonary valve, • pulmonary trunk, • pulmonary arteries, • lungs, • pulmonary veins, • left atrium, • mitral (bicuspid) valve, • left ventricle, aortic valve, • aorta.