The function of conducting part in respiratory system of human is `:-`

Options

A. Clears foreign particles.
B. Humidifies atmospheric air
C. Brings the air to body temperature
D. All of the above

Answer

### Step-by-Step Solution:

1. **Understanding the Respiratory System**:
- The human respiratory system is divided into two main parts: the conducting part and the respiratory part.

2. **Identifying the Conducting Part**:
- The conducting part includes the structures that transport air to the sites of gas exchange. This part starts from the nostrils and includes the following structures:
- Nostrils
- Pharynx
- Larynx
- Trachea
- Bronchi (primary, secondary, and tertiary)
- Bronchioles (primary, secondary, and tertiary)

3. **Functions of the Conducting Part**:
- The conducting part has several important functions:
- **Clearing Foreign Particles**: It helps in the removal of foreign particles from the air. This is achieved through the production of mucus by goblet cells, which traps dust and other particles.
- **Humidifying Atmospheric Air**: The conducting part adds moisture to the incoming air, making it more suitable for the delicate tissues of the lungs.
- **Bringing Air to Body Temperature**: It warms the incoming air to body temperature, which is essential for optimal gas exchange in the lungs.

4. **Conclusion**:
- Therefore, the correct answer to the question about the function of the conducting part of the respiratory system is that it clears foreign particles, humidifies atmospheric air, and brings the air to body temperature. Hence, the correct option is **"all of the above."**