The maximum volume of air forcefully exhaled after taking the deepest possible breath is called :

Options

A. tidal volume
B. residual volume
C. vital capacity
D. total respiratory volume

Explanation

To solve the question about the maximum volume of air forcefully exhaled after taking the deepest possible breath, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the maximum volume of air that can be forcefully exhaled after taking the deepest possible breath.

2. **Identify Key Terms**: The key terms in this question are "maximum volume," "forcefully exhaled," and "deepest possible breath."

3. **Define Relevant Lung Volumes**:
- **Tidal Volume (TV)**: This is the amount of air we breathe in or out during normal breathing, which is approximately 500 ml.
- **Inspiratory Reserve Volume (IRV)**: This is the additional air that can be inhaled after a normal inhalation. It is typically around 2500 to 3000 ml.
- **Expiratory Reserve Volume (ERV)**: This is the additional air that can be exhaled after a normal exhalation, usually around 1000 to 1200 ml.

4. **Calculate the Vital Capacity**: The maximum volume of air that can be forcefully exhaled after taking the deepest breath is known as the **Vital Capacity (VC)**. It is calculated by adding the tidal volume, inspiratory reserve volume, and expiratory reserve volume:
\[ \text{Vital Capacity (VC)} = \text{Tidal Volume (TV)} + \text{Inspiratory Reserve Volume (IRV)} + \text{Expiratory Reserve Volume (ERV)} \]
Substituting the values:
\[ VC = 500 \, \text{ml} + 2500 \, \text{ml} + 1000 \, \text{ml} = 4000 \, \text{ml} \, \text{to} \, 4500 \, \text{ml} \]

5. **Conclusion**: The maximum volume of air that can be forcefully exhaled after taking the deepest possible breath is called **Vital Capacity**.

### Final Answer:
**Vital Capacity**

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