When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?

Options

A. It moves alon with oxygen into the cells
B. It comes out with the `CO_(2)` during exhalation
C. It is absorbed only by the nasal cells
D. Nitrogen concentration is already more in the cells so it is not at all absorbed.

Explanation

### Step-by-Step Solution:

1. **Understanding the Composition of Air**:
- Air is composed of various gases, primarily nitrogen (about 78%) and oxygen (about 21%). When we inhale, we take in both of these gases.

2. **Inhalation Process**:
- During inhalation, oxygen is the primary gas that our body needs for respiration. Nitrogen, although present, is not utilized by the body.

3. **Fate of Nitrogen in the Body**:
- Unlike oxygen, nitrogen is not absorbed or used by our cells. The human body does not have a mechanism to utilize nitrogen in its elemental form.

4. **Exhalation Process**:
- When we exhale, we release carbon dioxide, a waste product of respiration. The nitrogen that was inhaled also exits the body during exhalation.

5. **Conclusion**:
- Therefore, the fate of nitrogen that enters the body during breathing is that it is expelled unchanged along with carbon dioxide when we exhale.

6. **Correct Answer**:
- The correct option is that nitrogen comes out with carbon dioxide during exhalation.