Why do walls of trachea not collapse in less air in it

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Please find below the solution to the asked query     
                                                        
 
The trachea is a narrow tube that connects the pharynx to the bronchi of the respiratory system. The trachea is supported by a series of cartilaginous rings that prevent it from collapsing when there is less air in it.

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Because of the the presence of ring of cartillage
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