Rings of cartilage are present to ensure that the air passage doesn't collapse. Under what condition would the air passage collapse?
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When the trachea is dry or there is no air in it then the air passage can collapse.
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As the trachea is made of cartilaginous rings which are of C shape, it prevents the air passage not to collapse when we breathe out air. Due to the presence of rings of catilage, the air passage do not collapse when we breath out .
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