why does the air passage do not collapse when we breathe out
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The trachea or the windpipe connects the pharynx and larynx to our lungs. This allows air to pass in and out of the lungs. As the trachea is made of cartilaginous rings which are of C shape, it prevents the air passage not to collapse when we breath out air.
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The trachea is connected with lungs and pharynx. It is made up of many C - shaped cartilaginous rings. That's why it doesn't collapse when we breathe out.
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