NDA General Ability Question (2026) — Solution

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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