trachea does not collapse even when air not there because of present
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trachea does not collapse even when air not there because of present 'C' shaped cartilaginous rings on their outer wall
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The walls of trachea doesnot collapse even when air is not there because of the cartilage present over there.
#hasty:-) :-) :-) :-)
#hasty:-) :-) :-) :-)
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