Which of the following does not give the correct definition of a respiratory volume?

Options

A. Residual volume = Volume of air remaining in the lungs after normal expiration
B. Inspiratory reserve volume = Additional volume of air a person can inspire by forcible inspiration
C. Tidal volume = Volume of air inspired or expired during normal respiration.
D. Expiratory reserve volume = Additional volume of air a person can expire by forcible expiration

Answer

To solve the question regarding which option does not give the correct definition of a respiratory volume, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Understanding Residual Volume (Option A)**:
- The residual volume is defined as the volume of air that remains in the lungs after a normal expiration.
- This definition is correct. The typical value for residual volume in a normal human being is about 1200 milliliters.

2. **Understanding Inspiratory Reserve Volume (Option B)**:
- The inspiratory reserve volume is the additional volume of air that a person can inhale forcefully after a normal inspiration.
- This definition is also correct. The typical value for inspiratory reserve volume is about 500 milliliters.

3. **Understanding Tidal Volume (Option C)**:
- Tidal volume is defined as the volume of air that is inspired or expired during normal respiration (one breath).
- This definition is correct as well. The typical value for tidal volume is about 500 milliliters.

4. **Understanding Expiratory Reserve Volume (Option D)**:
- The expiratory reserve volume is the additional volume of air that a person can exhale forcefully after a normal expiration.
- This definition is correct. The expiratory reserve volume is also a recognized respiratory volume.

### Conclusion:
After reviewing all the options, it appears that all definitions provided in options A, B, C, and D are correct. However, the question asks for which does not give the correct definition of a respiratory volume. Since all definitions are accurate, it seems there may be a misunderstanding in the question or the options provided.

### Final Answer:
None of the options provided (A, B, C, D) incorrectly define a respiratory volume.