Which is the correct sequence of air passage during inhalation ?

Options

A. Nostrils `to` Larynx `to` Pharynx `to` Trachea `to` Lungs
B. Nasal passage `to` Trachea `to` Pharynx `to` Larynx `to` Alveoli
C. Larynx `to` Nostrils `to` Pharynx `to` Lungs
D. Nostrils `to` pharynx `to` Larynx `to` Trachea `to` Alveoli

Explanation

### Step-by-Step Solution:

1. **Nostrils**: The process of inhalation begins when air enters through the nostrils. The nostrils are the openings in the nose that allow air to flow into the respiratory system.

2. **Pharynx**: After passing through the nostrils, the air moves into the pharynx. The pharynx is a muscular tube that connects the nasal cavity to the larynx and is part of both the respiratory and digestive systems.

3. **Larynx**: From the pharynx, the air then travels to the larynx. The larynx, also known as the voice box, is responsible for sound production and also acts as a passageway for air.

4. **Trachea**: Next, the air moves down into the trachea, which is a tube that connects the larynx to the bronchi. The trachea is lined with cilia and mucus to trap particles and pathogens.

5. **Bronchi**: The trachea divides into two bronchi (one for each lung), which further branch into smaller bronchioles within the lungs.

6. **Alveoli**: Finally, the air reaches the alveoli, which are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs. Oxygen diffuses from the alveoli into the blood, while carbon dioxide diffuses from the blood into the alveoli to be exhaled.

### Correct Sequence of Air Passage During Inhalation:
**Nostrils → Pharynx → Larynx → Trachea → Bronchi → Alveoli**