The correct order of structures through which the air passes in the body is

Options

A. Nasal cavity, larynx, trachea, bronchi air sacs
B. Bronchi, nasal cavity, laryns, trachea air sacs
C. Larynx, bronchi, nasal cavity, trachea air sacs
D. Nasal cavity, trachea, larynx, bronchi air sacs.

Answer

To determine the correct order of structures through which air passes in the human respiratory system, we can break down the process step by step.

### Step-by-Step Solution:

1. **Nostrils**: The air enters the respiratory system through the nostrils. This is the first point of contact with the external environment.

2. **Nasal Chamber**: After passing through the nostrils, the air moves into the nasal chamber. Here, the air is warmed, moistened, and filtered.

3. **Pharynx**: From the nasal chamber, the air travels to the pharynx. The pharynx serves as a common passageway for both air and food.

4. **Larynx**: Next, the air moves into the larynx, which is also known as the voice box. The larynx plays a crucial role in sound production and also acts as a passageway for air.

5. **Trachea**: After the larynx, the air enters the trachea, commonly referred to as the windpipe. The trachea is a tube that directs air towards the lungs.

6. **Bronchi**: The trachea bifurcates into two primary bronchi (one for each lung). The bronchi further branch into smaller bronchi.

7. **Bronchioles**: The bronchi continue to divide into even smaller tubes called bronchioles, which lead to the air sacs.

8. **Alveoli**: Finally, the air reaches the alveoli, which are tiny air sacs where the exchange of gases (oxygen and carbon dioxide) occurs.

### Correct Order:
The correct order of structures through which air passes is:
1. Nostrils
2. Nasal Chamber
3. Pharynx
4. Larynx
5. Trachea
6. Bronchi
7. Bronchioles
8. Alveoli

### Final Answer:
The correct sequence is: **Nasal Chamber → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli.**