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What is the significance of the "C-shaped" cartilages that reinforce the trachea

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What is the significance of the "C-shaped" cartilages that reinforce the trachea

What is the significance of the "C-shaped" cartilages that reinforce the tracheal rings?
A) These cartilages hold the trachea rigidly open at the same diameter at all times.
B) The incomplete portion of the C-shaped cartilages are located at the posterior of the tracheal cartilages, to permit the esophagus to bulge anteriorly into the tracheal lumen in transient fashion to permit a large bolus to pass.
C) They form a solid cartilaginous tube.
D) The open region permits passage of the nerves that stimulate the muscles of the laryngeal region.
E) None of the answers are correct.

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