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Question: Answered & Verified by Expert
Select the correct option regarding respiratory volumes.
BiologyBreathing and Exchange of GasesNEET
Options:
  • A Total capacity of lungs = Vital capacity + Tidal air
  • B Vital capacity of lungs = Total lung capacity - Residual air
  • C Vital capacity of lungs = Tidal air + Complemental air
  • D Total capacity of lungs = Tidal air + Complemental air + Supplemental air
Solution:
2026 Upvotes Verified Answer
The correct answer is: Vital capacity of lungs = Total lung capacity - Residual air
Vital capacity of lungs is the maximum volume of air a person can breathe in after forced expiration. This includes ERV, TV, and IRV or the maximum volume of air a person can breathe out after a forced inspiration.

VC = TV + ERV + RV

Total lung capacity is the sum of the vital capacity and residual volume i.e.,

TLC = VC + RV 

Hence, VC = TV - RV 

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