Body carries deoxygenated blood to the superior & inferior vena cava. Travels into the right atrium through the tricuspid valve & into the right ventricle. The blood goes into the pulmonary semilunar valve, to the pulmonary trunk, and to the pulmonary arteries. From there it goes to the lungs, picks up oxygenated blood and travels to the pulmonary veins. Then it goes to the left artrium, through the mitral valve, to the aortic semilunar valve, and to the aorta.