Question

what do the wall of trachea not collapse when there is less air in it

Answer 1

Why do the walls of trachea not collapse when there is less air in it? Trachea is supported by c-shaped rings of cartilage which hold them in place when there is less air inside it. So, the walls of trachea do not collapse even when there is a little air.

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Answer 2

because the trachea is surounded by many C shaped bone catilage which prevent it to collaps