Q99 / 270 · NDA 2026 (Phase 1) · General Ability
Which one of the following respiratory volumes of human lung is the lowest?
- AResidual volume
- Correct answerBTidal volume
- CInspiratory reserve volume
- DExpiratory reserve volume
Solution
The normal respiratory volumes for a healthy adult human are as follows:
Tidal volume (TV) is the volume of air inspired or expired during normal respiration, which is approximately $500$ mL.
Inspiratory reserve volume (IRV) is the additional volume of air a person can inspire by a forcible inspiration, which is approximately $2500$ to $3000$ mL.
Expiratory reserve volume (ERV) is the additional volume of air a person can expire by a forcible expiration, which is approximately $1000$ to $1100$ mL.
Residual volume (RV) is the volume of air remaining in the lungs even after a forcible expiration, which is approximately $1100$ to $1200$ mL.
Comparing these values, the tidal volume is the lowest.
Answer: Tidal volume
Tidal volume (TV) is the volume of air inspired or expired during normal respiration, which is approximately $500$ mL.
Inspiratory reserve volume (IRV) is the additional volume of air a person can inspire by a forcible inspiration, which is approximately $2500$ to $3000$ mL.
Expiratory reserve volume (ERV) is the additional volume of air a person can expire by a forcible expiration, which is approximately $1000$ to $1100$ mL.
Residual volume (RV) is the volume of air remaining in the lungs even after a forcible expiration, which is approximately $1100$ to $1200$ mL.
Comparing these values, the tidal volume is the lowest.
Answer: Tidal volume
Hence, the correct answer is option: 'B'.