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STD 11 - 14. Breathing and exchange in gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 14. Breathing and exchange in gases1 Mark
MCQ
What is vital capacity of our lungs?
  • A
    Inspiratory reserve volume plus expiratory reserve volume
  • ✓
    Total lung capacity minus residual volume
  • C
    Inspiratory reserve volume plus tidal volume
  • D
    Total lung capacity minus expiratory reserve volume
✓

Answer

Correct option: B.
Total lung capacity minus residual volume
b
(b) : Vital capacity is the amount of air which one can inhale or exhale with maximum effort. It is the sum of tidal volume, inspiratory reserve volume and expiratory reserve volume, while total lung capacity is the total amount of air present in the lungs and the respiratory passage after a maximum inspiration. It is the sum of the vital capacity and the residual volume. $TLC = VC + RV$. So, vital capacity is also total lung capacity $(TLC)$ -residual volume $(RV)$.

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