SUMMARY
1. Deoxygenated blood enters right atrium through Superior and Inferior Vena Cava
2. Blood enters right ventricle through tricuspid valve
3. Blood exits right ventricle through pulmonary valve and enters pulmonary artery
4. Left and right pulmonary arteries send blood to lungs, where gas exchange occurs
5. Oxygenated blood returns to heart via the pulmonary veins  enters left atrium
6. Blood enters left ventricle through mitral valve
7. Blood exits left ventricle through aortic semilunar valve to enter aorta
8. Aorta distributes blood to body

3D model from:
https://www.cgtrader.com/3d-models/ch...