Question

Why do trachea and bronchi not collapse when air is exhaled out during expiration?

Answer 1

The trachea does not collapse even if the air pressure is less inside it. Because it has a series of cartilaginous rings which form a relatively rigid arrangement. The C - shaped cartilage rings are present till the trachea bifurcates into the bronchi. ... This prevents it from collapsing due to pressure changes.

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