why trachea have ring like structure?
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Ring like structures prevents trachea from collapsing when there is no air inside it.
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The trachealis muscle connects the ends of the incomplete rings and contracts during coughing, reducing the size of the lumen of the trachea to increase the rate of air flow. ... The cartilaginous rings are incomplete to allow the trachea to collapse slightly so that food can pass down the esophagus.
that is y trachea has ring like structures
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