The air cells of the lungs are the:
A) cilia.
B) pleura.
C) alveoli.
D) bronchi.
C
Explanation: A) The cilia are hairlike structures that line the trachea and nasal cavity.
B) The pleura is the serous membrane that lines the walls of the thoracic cavity.
C) Correct.
D) The bronchi are major passageways for air between the trachea and the lungs.
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