(A) inspiratory capacity
(B) expiratory capacity
(C) functional residual capacity
Choose the correct option for A , B and C

Options

A. (1) A-TV+ERV,B-TV+IRV,C-EVR+RV
B. (2) A-TV+ERV,B-TV+ERV,C- TV+IRV
C. .(3) A-TV+IRV,B-TV+ERV,C-EVR+RV
D. (4) A-TV+ERV,B-TV+IRV,C-EVR+RV

Answer

To answer the question regarding the definitions of inspiratory capacity, expiratory capacity, and functional residual capacity, we will break down each term step by step.

### Step-by-Step Solution:

1. **Inspiratory Capacity (A)**:
- **Definition**: Inspiratory capacity is the total volume of air that a person can inhale after a normal expiration.
- **Components**: It is calculated by adding the tidal volume (TV) and the inspiratory reserve volume (IRV).
- **Formula**:
\[ \text{Inspiratory Capacity (IC)} = \text{Tidal Volume (TV)} + \text{Inspiratory Reserve Volume (IRV)} \]

2. **Expiratory Capacity (B)**:
- **Definition**: Expiratory capacity is the total volume of air that a person can exhale after a normal inspiration.
- **Components**: It is calculated by adding the tidal volume (TV) and the expiratory reserve volume (ERV).
- **Formula**:
\[ \text{Expiratory Capacity (EC)} = \text{Tidal Volume (TV)} + \text{Expiratory Reserve Volume (ERV)} \]

3. **Functional Residual Capacity (C)**:
- **Definition**: Functional residual capacity is the volume of air that remains in the lungs after a normal expiration.
- **Components**: It is calculated by adding the expiratory reserve volume (ERV) and the residual volume (RV).
- **Formula**:
\[ \text{Functional Residual Capacity (FRC)} = \text{Expiratory Reserve Volume (ERV)} + \text{Residual Volume (RV)} \]

### Final Answers:
- (A) Inspiratory Capacity = Tidal Volume + Inspiratory Reserve Volume
- (B) Expiratory Capacity = Tidal Volume + Expiratory Reserve Volume
- (C) Functional Residual Capacity = Expiratory Reserve Volume + Residual Volume