Which part of the respiratory system is supported by cartilaginous rings to keep it distended?

The trachea serves as the airway of the body providing a passage for oxygen to reach the lungs. The tube of the trachea is reinforced with strong rings made of hyaline cartilage. The main purpose of these rings is to keep the trachea open while breathing. Without the cartilage rings, the trachea would collapse in on itself during respiration due to changes in the air pressure.