Which of the following statements is correct?

Options

A. Inspiration is an active process
B. Inspirtion is a passive process
C. Expiration is an active process
D. Both expiration and inspiration are passive processes

Answer

To determine which statement is correct regarding the processes of breathing, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Analyze the First Statement: "Inspiration is an active process."**
- **Explanation:** Inspiration, or inhalation, is the process where air is drawn into the lungs. This process requires energy and involves the contraction of the diaphragm and intercostal muscles, making it an active process.
- **Conclusion:** This statement is **correct**.

2. **Analyze the Second Statement: "Inspiration is a passive process."**
- **Explanation:** This statement contradicts the first statement. Since inspiration requires muscular effort to draw air into the lungs, it cannot be classified as a passive process.
- **Conclusion:** This statement is **incorrect**.

3. **Analyze the Third Statement: "Expiration is an active process."**
- **Explanation:** Expiration, or exhalation, is primarily a passive process during normal breathing. It occurs when the diaphragm and intercostal muscles relax, allowing the lungs to deflate and air to be expelled without the need for muscular contraction.
- **Conclusion:** This statement is **incorrect**.

4. **Analyze the Fourth Statement: "Both expiration and inspiration are passive processes."**
- **Explanation:** As established, inspiration is an active process, while expiration is generally passive. Therefore, this statement is also incorrect.
- **Conclusion:** This statement is **incorrect**.

### Final Conclusion:
Based on the analysis, the only correct statement is the first one: "Inspiration is an active process."