Why do the walls of trachea not collapse when there is less air in it?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Structure of the Trachea**: The trachea, commonly known as the windpipe, is a tube that connects the throat (pharynx) with the lungs. It is an essential part of the respiratory system.

2. **Presence of Cartilage**: The walls of the trachea contain C-shaped rings made of cartilage. These rings are crucial for maintaining the structure of the trachea.

3. **Function of the Cartilage Rings**: The C-shaped cartilage rings provide structural support to the trachea. They prevent the trachea from collapsing, even when there is less air inside.

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