Why does the trachea not deflate (collapse) during exhalation?
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The trachea is strengthened by C-shaped cartilages which are not completely ring-like but makes the structure of "C" which gives the tracheal tube rigidity. Also, these rings are maintained at their positions by muscles and fibrous connective tissues which hold them together and help adjust the rings as per the requirement. Thus, preventing the collapse of the tube during exhalation when there is very less air present.
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