in which part gaseous exchange take place in rabbit

Options

A. 1)Traches `&` alveolar duct
B. 2)Trachea `&` bronchi
C. 3)Alveolar duct `&` alveoli
D. 4)Alveoli `&` Trachea

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question asks about the gaseous exchange in rabbits, which are mammals.

2. **Understand the Respiratory System**: Mammals, including rabbits, have lungs as their primary respiratory organs. The respiratory system consists of various structures that facilitate gas exchange.

3. **Trace the Pathway of Air**:
- Air enters through the **trachea**, which is a straight tube that leads to the lungs.
- The trachea divides into **right and left primary bronchi**.
- Each primary bronchus further divides into **secondary and tertiary bronchi**, and eventually into smaller branches known as **bronchioles**.

4. **Identify the Site of Gas Exchange**:
- The bronchioles terminate in **terminal bronchioles**, which lead to **alveoli**.
- Alveoli are thin-walled, vascularized structures that are the primary sites for gas exchange.

5. **Evaluate the Options**:
- **Option 1**: Trachea and alveolar duct - Incorrect, as the trachea does not participate in gas exchange.
- **Option 2**: Trachea and bronchi - Incorrect, as neither the trachea nor bronchi are sites of gas exchange.
- **Option 3**: Alveolar duct and alveoli - Correct, as both are involved in gas exchange.
- **Option 4**: Alveoli and trachea - Incorrect, as the trachea does not participate in gas exchange.

6. **Conclusion**: The correct answer is **Option 3: Alveolar duct and alveoli**.

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