After deep inspiration, capacity of maximum expiration of lung is called

Options

A. total lung capacity
B. functional residual capacity
C. vital capacity
D. inspiratory capacity

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes the lung capacity after a deep inspiration, specifically focusing on the maximum expiration.

2. **Identifying Key Terms**:
- Deep inspiration refers to taking a full breath in.
- Maximum expiration refers to the maximum amount of air that can be expelled from the lungs after taking a deep breath.

3. **Defining Lung Capacities**:
- **Total Lung Capacity (TLC)**: The total volume of air the lungs can hold.
- **Functional Residual Capacity (FRC)**: The volume of air remaining in the lungs after a normal expiration.
- **Vital Capacity (VC)**: The maximum amount of air that can be exhaled after a maximum inhalation.
- **Inspiratory Capacity (IC)**: The maximum amount of air that can be inhaled after a normal expiration.

4. **Selecting the Correct Answer**:
- The question specifies the capacity after deep inspiration and refers to maximum expiration. The correct term for this is **Vital Capacity (VC)**, which is the total volume of air that can be inhaled and exhaled with maximum effort.

5. **Calculating Vital Capacity**:
- Vital Capacity (VC) is calculated using the formula:
\[ VC = TV + IRV + ERV \]
where:
- **TV (Tidal Volume)**: The amount of air inhaled or exhaled during normal breathing.
- **IRV (Inspiratory Reserve Volume)**: The maximum amount of air that can be inhaled after a normal inhalation.
- **ERV (Expiratory Reserve Volume)**: The maximum amount of air that can be exhaled after a normal exhalation.

6. **Conclusion**: The vital capacity typically ranges from 4000 to 4600 ml in a healthy adult.

**Final Answer**: The capacity of maximum expiration of the lung after deep inspiration is called **Vital Capacity (VC)**.

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