If a person first inspires with his utmost effort and then expires also with maximum effort, the volume of breathed out is called the

The volume of air breathed out after a person first inspires with utmost effort (maximal inspiration) and then expires with maximum effort (maximal expiration) is defined as the Vital Capacity (VC) [1]. Vital capacity represents the maximum volume of air that can be forcefully expired following a maximal inspiratory effort. Mathematically, it is the sum of the Inspiratory Reserve Volume (IRV), Tidal Volume (TV), and Expiratory Reserve Volume (ERV). In contrast, Tidal Volume is the air moved during quiet breathing [1], while Expiratory Reserve Volume is only the additional air exhaled after a normal tidal expiration. Residual volume is the air remaining in the lungs even after such a maximal expiratory effort. Therefore, the total volume exhaled between the two extremes of lung capacity is the Vital Capacity.

Sources

1. [1] https://en.wikipedia.org/wiki/Lung_volumes_and_capacities