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.
So it doesn't collapse when you breathe. =]
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.
The un-reinforced trachea would be kept OPEN during an exhalation. It is during an inhalation that it might collapse on itself. Slight secondary support is offered by the connective tissue that surrounds the trachea, but this is elastic material and would not offer much reinforcement. If the individual breathed very slowly and was supported on their hands and knees (the chest suspended down), there is a chance they could breath very gently Thin individuals would have a better chance.. Falcongyre
To hold the trachea open; to make sure it does not collapse.
So your windpipe won't collapse when you move your head.
Because it stops the blood flowing out
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.
Cartilage is necessary in the wall of the trachea because it supports the trachea and keeps it open at all times. New born babies do not have these rings of cartilage around their trachea, which is why their heads need to always be supported carefully.