Deoxygenated blood goes into the superior/inferior vena cava, then to the right atrium, through the tricuspid valve, to the right ventricle, through the pulmonary semilunar valve, and into the pulmonary trunk, separated by the pulmonary arteries. The pulmonary arteries go to the lungs, blood gets oxygenated, and returns back to the heart with pulmonary veins. The blood goes into the left atrium, through the bucuspid (mitral) valve, and into the left ventricle. The bloo then goes into the aortic semilunar valve and to the aorta. It goes to the body, gets deoxygenated, and goes back to the superior/inferior vena cava.
