The wall that separates the right ventricle from the left ventricle is the
- A. pericardium
- B. interventricular septum
- C. mitral valve
- D. aorta
Explanation
The muscular septum keeps oxygenated and deoxygenated blood completely separate, which is essential for the high efficiency of the mammalian double circulation. A hole in it, a septal defect, lets the two streams mix.