Diffustion of gases occurs in the alveolar region only and not in the other parts of respiratory system. Why?

Explanation

To answer the question of why diffusion of gases occurs in the alveolar region only and not in other parts of the respiratory system, we can break down the reasoning into several key points:

### Step-by-Step Solution:

1. **Understanding Gas Exchange**: Gas exchange involves the movement of oxygen and carbon dioxide between the air in the lungs and the blood in the capillaries. This process relies on diffusion, which is the movement of gases from an area of higher concentration to an area of lower concentration.

2. **Characteristics of Effective Respiratory Surfaces**: For efficient gas exchange, a respiratory surface must have certain characteristics:
- **Thin**: The surface should be thin to allow gases to diffuse easily.
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