Vital capacity of lung is;

Explanation:

• Vital Capacity (VC) is the maximum volume of air a person can breathe out after a maximum inspiration.

• It includes:

  • Inspiratory Reserve Volume (IRV) – extra air that can be inhaled after a normal inspiration.

  • Tidal Volume (TV) – air inhaled or exhaled during normal breathing.

  • Expiratory Reserve Volume (ERV) – extra air that can be exhaled after a normal expiration.

So,
👉 VC = IRV + TV + ERV