The central portion of the thoracic cavity, between the lungs, is a space called the:
A) mediastinum.
B) septum.
C) diaphragm.
D) bronchi.
A
Explanation: A) Correct.
B) The septum is a dividing wall, such as the nasal septum.
C) The diaphragm is a muscle that lies transversely between the thoracic and abdominal cavities.
D) The bronchi are the two main branches of the trachea, which provide the passageway for air to the lungs.
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