The musculomembranous wall that separates the thoracic and abdominal cavities is called:
A) mediastinum.
B) septum.
C) diaphragm.
D) hilum.
C
Explanation: A) The mediastinum is the central portion of the thoracic cavity, between the lungs.
B) A septum is a dividing wall, such as the nasal septum.
C) Correct.
D) The hilum is where the bronchi enter the lungs.
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