Question

why do the walls of trachea not collapse when is less in it?​

Answer 1

Answer:

Walls of trachea have incomplete cartilaginous rings surrounding it ! which prevent it from collapsing

Answer 2

Answer:

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. The cartilage provides support to the trachea which does not collapse even when there is less air in it