Why are the rings of cartilage surrounding the trachea C-shaped?
A) The C rings of cartilage keep the trachea patent (open).
B) The C rings of cartilage allow the esophagus to expand during swallowing.
C) The C rings of cartilage allow the esophagus to expand during swallowing, allow the trachea to change diameter during breathing, and keep the trachea patent (open).
D) The C rings of cartilage allow the trachea to change diameter during breathing.
Answer: C
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