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The trachea and bronchi are provided wit...

The trachea and bronchi are provided with C − shaped cartilaginous rings which

A

Are responsible for sound production

B

Give them support and prevent their collapse

C

Divide trachea and bronchi

D

Give support to lungs

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**Step-by-Step Solution:** 1. **Understanding the Structure**: The trachea (windpipe) and bronchi are part of the respiratory system. They are tubular structures that transport air to and from the lungs. 2. **C-Shaped Cartilaginous Rings**: The trachea and bronchi are reinforced with C-shaped cartilaginous rings. These rings are made of cartilage, which is a flexible connective tissue. 3. **Function of the Rings**: - **Support**: The primary function of these C-shaped rings is to provide structural support to keep the airways open. This prevents the trachea and bronchi from collapsing, especially during inhalation when the pressure inside the airways decreases. - **Flexibility**: The open part of the C-shape allows for flexibility and expansion of the esophagus (which lies behind the trachea) during swallowing. - **Protection**: The rigidity of the rings protects the airway from external pressure and damage. 4. **Conclusion**: Therefore, the C-shaped cartilaginous rings in the trachea and bronchi play a crucial role in maintaining the patency (openness) of the airways, ensuring that air can flow freely to and from the lungs. **Final Answer**: The trachea and bronchi are provided with C-shaped cartilaginous rings which provide support and prevent their collapse. ---
**Step-by-Step Solution:** 1. **Understanding the Structure**: The trachea (windpipe) and bronchi are part of the respiratory system. They are tubular structures that transport air to and from the lungs. 2. **C-Shaped Cartilaginous Rings**: The trachea and bronchi are reinforced with C-shaped cartilaginous rings. These rings are made of cartilage, which is a flexible connective tissue. 3. **Function of the Rings**: - **Support**: The primary function of these C-shaped rings is to provide structural support to keep the airways open. This prevents the trachea and bronchi from collapsing, especially during inhalation when the pressure inside the airways decreases. ...
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