Ans :- Cartilage rings present in trachea to prevent it to collapse when air is not passing through it.

Importance of Cartilage Rings in Trachea
The presence of cartilage rings in the trachea is crucial for several reasons:

Structural Support
- Cartilage rings provide structural support to the trachea, preventing it from collapsing and maintaining the airway open.
- These rings are C-shaped, with the open part of the "C" facing the esophagus, allowing the trachea to expand and contract during breathing without compromising its integrity.

Protection
- The cartilage rings protect the trachea from external pressure and trauma.
- They act as a shield, preventing the trachea from being compressed or damaged by surrounding structures.

Facilitation of Breathing
- The presence of cartilage rings in the trachea ensures that air can flow freely into and out of the lungs.
- These rings prevent the trachea from collapsing when negative pressure is created during inhalation.

Maintenance of Shape
- The semi-rigid nature of cartilage rings helps maintain the shape of the trachea, allowing it to stay open and functional at all times.
- This ensures that the trachea can perform its primary function of transporting air to and from the lungs efficiently.
In conclusion, cartilage rings play a vital role in the structure and function of the trachea. Their presence ensures that the airway remains open, protected, and capable of facilitating the process of breathing effectively.