The CORRECT sequence of the pathway of air from outside to inside the lungs is

Options

A. Larynx-trachea-alveoli-bronchus-pharynx
B. Pharynx- larynx-trachea-bronchus-alveoli
C. Trachea-larynx-bronchus-pharynx-alveoli
D. Alveoli-larynx-pharynx-bronchus-trachea

Answer

To determine the correct sequence of the pathway of air from outside to inside the lungs, we need to understand the respiratory system's anatomy and the order in which air travels through it. Here’s a step-by-step breakdown of the pathway:

1. **Nasal Cavity**: Air enters the body through the nasal cavity, where it is filtered, warmed, and moistened.
- **Hint**: Think of the nasal cavity as the first entry point for air, where it gets prepared for the lungs.

2. **Pharynx**: From the nasal cavity, air moves into the pharynx, which is a common passage for both air and food.
- **Hint**: Remember that the pharynx serves as a pathway for air to continue towards the lungs.

3. **Larynx**: Next, air travels into the larynx, also known as the voice box, which is responsible for sound production and also acts as a passageway for air.
- **Hint**: The larynx is often associated with vocalization, but it’s also crucial for directing air to the trachea.

4. **Trachea**: After the larynx, air moves into the trachea, commonly referred to as the windpipe, which directs air into the bronchi.
- **Hint**: The trachea is a sturdy tube that ensures air can pass through without collapsing.

5. **Bronchi**: The trachea then divides into two primary bronchi (left and right), which lead into each lung.
- **Hint**: Think of the bronchi as the main highways that branch off to each lung.

6. **Bronchioles**: The bronchi further divide into smaller branches called bronchioles, which spread throughout the lungs.
- **Hint**: Bronchioles are like smaller streets that lead deeper into the lung tissue.

7. **Alveoli**: Finally, air reaches the alveoli, tiny air sacs where gas exchange occurs (oxygen enters the blood, and carbon dioxide is removed).
- **Hint**: Alveoli are the final destination for air, where the crucial exchange of gases happens.

Putting this all together, the correct sequence of the pathway of air from outside to inside the lungs is:
**Nasal Cavity → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli.**

Thus, the correct answer is **Option 2: Pharynx, Larynx, Trachea, Bronchus, Alveoli.**