Cartilaginous rings
A)make the trachea rigid to keep the airway open.
B)make the primary bronchi rigid to keep them open.
C)are C shaped in the trachea to allow the esophagus to expand behind it.
D)are made of hyaline cartilage.
E)all of the choices are correct.

Question

Quizplus · Accepted Answer

All of the choices are correct. Cartilaginous rings are C-shaped structures made of hyaline cartilage that make the trachea and primary bronchi rigid to keep the airway open. The C-shape of the rings allows the esophagus to expand behind them as food passes through.

Cartilaginous Rings