Which organ of our respiratory system acts as primary site of exchange of gases ?

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the organ in the respiratory system that serves as the primary site for gas exchange.

2. **Understand the Function of the Respiratory System**: The respiratory system is responsible for the exchange of gases, specifically oxygen and carbon dioxide, between the body and the environment.

3. **Locate the Specific Organ**: Within the respiratory system, there are several structures, but the primary site of gas exchange is crucial to identify.

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