Answers 5. Tricuspid valve 10. Pulmonary veins 13. Left ventricle 9. Lungs 12. Mitral valve 1. Venules 7. Pulmonary semilunar valve 8. Pulmonary arteries 2. Veins 4. Right atrium 6. Right Ventricle 18. Capillaries 14. Aortic semilunar valve 16. Arteries 3. Inferior vena cava & superior vena cava 11. Left atrium 17. Arterioles 15. Aorta |