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.

Question

Quizplus · Accepted Answer

The trachea contains C-shaped cartilaginous rings that provide structural support and prevent collapse while allowing flexibility in movement.

Answer: B 
 This statement is incorrect. The pulmonary artery is not located within the trachea, and gas exchange between oxygen and carbon dioxide occurs in the alveoli of the lungs, not in the trachea.

Answer: C 
 This statement is also incorrect. The trachea is not lined with surfactant-secreting cells; rather, it is lined with ciliated mucous membranes that help trap and remove foreign particles and pathogens from the respiratory tract.

Answer: D 
 The trachea is located within the mediastinum, which is the central region of the thoracic cavity between the two lungs. It is not located within the pleural cavity, which is the space between the two layers of the pleural membrane that surrounds the lungs.

The Trachea