Which of the following is sets of option depicts the total volume of area accommodated in the lungs at the end of a forced inspiration and the expression to calculate the same ?

Options

A. Total lung capacity : VC + RV
B. Expiratory capacity : TV + ERV
C. Vital capacity : FRC + TV
D. Inspiratory capacity : TV + IRV

Answer

To solve the question regarding the total volume of air accommodated in the lungs at the end of forced inspiration and the expression to calculate the same, we will follow these steps:

### Step 1: Understand the Terminology
- **Total Lung Capacity (TLC)**: This is the maximum amount of air that the lungs can hold. It is the sum of all lung volumes.
- **Vital Capacity (VC)**: This is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It includes the tidal volume (TV), inspiratory reserve volume (IRV), and expiratory reserve volume (ERV).
- **Residual Volume (RV)**: This is the amount of air that remains in the lungs after a forced expiration.

### Step 2: Identify the Components of Total Lung Capacity
- The Total Lung Capacity can be expressed as:
\[ TLC = VC + RV \]
- Here, VC includes the tidal volume (TV), inspiratory reserve volume (IRV), and expiratory reserve volume (ERV).

### Step 3: Analyze the Options
- The question asks for the correct set of options that depict the total volume of air in the lungs at the end of forced inspiration and the expression to calculate it.
- The correct option should reflect the Total Lung Capacity, which is calculated using the formula mentioned above.

### Step 4: Evaluate Other Options
- **Expiratory Capacity**: This is defined as tidal volume plus expiratory reserve volume (TV + ERV). This does not represent the total lung capacity.
- **Vital Capacity**: This is not equal to FRC + TV. Vital capacity is the sum of TV, IRV, and ERV.
- **Inspiratory Capacity**: This is tidal volume plus inspiratory reserve volume (TV + IRV), which again does not represent the total lung capacity.

### Conclusion
The correct answer to the question is the option that states:
- **Total Lung Capacity (TLC) = Vital Capacity (VC) + Residual Volume (RV)**.