The incomplete sections of the tracheal rings allow the esophagus to:

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 The incomplete sections of the tracheal rings allow the esophagus to:

 




Expand into the trachea when swallowing a food bolus
 


Compress the trachea during vomiting
 


Close over the trachea, keeping food from entering the lungs
 


There are no incomplete sections of the tracheal rings
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