4.Why do the walls of the trachea not collapse when there is less air in it?

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Presence of ring of cartilage prevents trachea from collapsing.

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because it is surrounded by c shaped cartiligious rings they make trachae open even if less air is in it.

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The walls of trachea are supported by 16 - 20 'C' shaped cartilagenous rings. That is the reason why the trachea doesn't collapse

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