Label ALL of the following structures:
1. right atrium
2. left atrium
3. right ventricle
4. left ventricle
5. pulmonary vein(s)
6. aortic semilunar valve
7. pulmonary semilunar valve
8. tricuspid valve
9. bicuspid valve
10. inferior vena cava
11. superior vena cava
12. aorta
13. pulmonary artery(ies)

Dr. arenas is a scientist who has been trying to determine if increasing pressure will increase the sound that occurs when two chemicals explode. it measures the volume of the sound that occurs at the minimum pressure at which the explosion will occur. it then increases the pressure and measures the volume of the explosions that occur. what kind of investigation is the scientist conducting?