The function of cartilaginous rings in a trachea is to prevent collapse of trachea. The trachea shouldn't not collapse if so you will die due to suffocation.
The walls of trachea contain c-shaped rings or cartilagenous rings.These soft bones provide rigidity to the trachea , that is why the walls of trachea doesn't collapse when there is less air.
trachea
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Trachea has C shaped cartilage rings. This makes the anatomical arrangement unique. So that trachea can contract and relax but does not collapse.
To hold the trachea open; to make sure it does not collapse.
So your windpipe won't collapse when you move your head.
Esophagus is smooth in texture... Trachea is segmented in texture because trachea contains cartilage rings... Due to presence of cartilage rings, it is made sure that the trachea doesn't collapse leading to difficulty in breathing.. Anatomically, trachea is placed ventral to esophagus.
The C-shaped cartilage rings surrounding the trachea act as a support system, and allow the trachea to remain opened and prevent collapse with normal body movements.
...pressure changes that occur during breathing.
it takes 76 lbs of pressure to collapse/crush one's windpipe
So they don't collapse when the pressure drops.