The Trachea

Question

The trachea
A) contains C-shaped cartilaginous rings.
B) encircles the pulmonary artery, where gas exchange occurs.
C) is lined with surfactant-secreting cells.
D) is located within the pleural cavity.

Accepted Answer

The trachea contains C-shaped cartilaginous rings that help to keep the airway open and prevent collapse during breathing.

Answer: D
 The trachea is located within the neck and upper chest, but not within the pleural cavity, which is where the lungs are located.

B and C are incorrect because the trachea does not encircle the pulmonary artery and does not have surfactant-secreting cells.