The Human Respiratory System · NCERT Biology

Total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of a forced inspiration. It includes:

  1. RV + ERV + TV + IRV
  2. RV + ERV + TV only
  3. ERV + TV + IRV only
  4. RV + IRV only
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Correct answer: RV + ERV + TV + IRV

Total Lung Capacity (TLC) includes Residual Volume (RV), Expiratory Reserve Volume (ERV), Tidal Volume (TV), and Inspiratory Reserve Volume (IRV). It can also be defined as Vital Capacity + Residual Volume.

Difficulty: Medium Question 12 of 20

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