During respiration in humans, the exchange of gases takes place in :

Options

A. bronchi
B. alveolic
C. bronchioles
D. trachea

Answer

**Step-by-Step Solution:**

1. **Identify the Respiratory Organs**: In humans, the primary respiratory organs are the lungs. This is where the process of respiration occurs.

2. **Understand the Structure of the Respiratory System**: The air enters through the nose and travels down the trachea (windpipe). The trachea branches into two tubes called bronchi, which lead into each lung.

3. **Explore the Branching of Bronchi**: Each bronchus further divides into smaller branches known as bronchioles. These bronchioles continue to branch out and become thinner tubes.

4. **Locate the Alveoli**: At the end of the bronchioles, there are tiny air sacs called alveoli. These are the crucial structures where the exchange of gases occurs.

5. **Gas Exchange Process**: In the alveoli, oxygen from the air is absorbed into the blood, and carbon dioxide from the blood is released into the air to be exhaled.

6. **Conclusion**: The main site of gas exchange during respiration in humans is the alveoli.

**Final Answer**: The exchange of gases during respiration in humans takes place in the **alveoli**.

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