why tracheas not collapsed when air absent in it
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Explanation:
The trachea is covered by incomplete C- shaped cartilaginous rings . The trachea is composed of about 20 rings of tough cartilage. The back part of each ring is made of muscle and connective tissue. This ring prevents trachea from collapsing when there is less air in it.
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The trachea is covered by incomplete C- shaped cartilaginous rings . The trachea is composed of about 20 rings of tough cartilage. This ring prevents trachea from collapsing when there is less air in it. The trachea is composed of rings of tough cartilage.
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