Deoxygenated blood goes through the superior and inferior vena cava.Then it goes through the right atrium, through the tricuspid valve, into the right ventricle. Then it goes into the pulmonary semi lunar valve, the pulmonary trunk, to the pulmonary arteries, into the lungs where oxygen gets picked up and goes into the pulmonary veins. Then into the left atrium, through the mitral/bicuspid valve, and into the left ventricle. Then into the aortic semi lunar valve and into the aorta, into the body where it is released and becomes deoxygenated again and the process starts over.