The respiratory gases are exchanged in

Options

A. villi
B. pharynx
C. alveoli
D. bronchi

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where respiratory gases (oxygen and carbon dioxide) are exchanged in the body. This involves identifying the specific body part responsible for this exchange.

2. **Identifying the Process of Breathing**: When we breathe in, we take in oxygen (O2) and when we breathe out, we release carbon dioxide (CO2). The exchange of these gases occurs in a specific location in the respiratory system.

3. **Exploring the Options**:
- **Option A: Villi**: Villi are found in the small intestine and are responsible for nutrient absorption, not gas exchange.
- **Option B: Pharynx**: The pharynx is a passageway for both air and food but does not facilitate gas exchange.
- **Option C: Alveoli**: Alveoli are tiny air sacs in the lungs where the actual exchange of gases occurs. Oxygen is absorbed into the blood, and carbon dioxide is released from the blood into the alveoli to be exhaled.
- **Option D: Bronchi**: The bronchi are tubes that carry air to the lungs but are not involved in the exchange of gases.

4. **Conclusion**: Based on the analysis of the options, the correct answer is **Option C: Alveoli**, as this is where the exchange of respiratory gases takes place.

**Final Answer**: The respiratory gases are exchanged in the **alveoli**.

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