What formula represents the calculation of Vital Capacity?

Vital Capacity (VC) is defined as the maximum amount of air that can be exhaled after a maximum inhalation. The formula to calculate Vital Capacity is the sum of three key components of lung function: Inspiratory Reserve Volume (IRV), Tidal Volume (Vt), and Expiratory Reserve Volume (ERV).

• Inspiratory Reserve Volume (IRV) is the additional amount of air that can be inhaled after a normal inhalation.
• Tidal Volume (Vt) is the amount of air that is inhaled or exhaled during normal breathing.

• Expiratory Reserve Volume (ERV) is the additional amount of air that can be forcibly exhaled after the expiration of a normal tidal volume.

When you add IRV, Vt, and ERV together, you effectively measure the capacity of the lungs that can be used in various forms of respiration, making this the proper formula for Vital Capacity.

In contrast, including Residual Volume (RV) in the other options is incorrect for this calculation of Vital Capacity. RV refers to the volume of air remaining in the lungs after maximum exhalation and does not contribute to the total amount of usable air for inhalation and exhalation that Vital