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A medical student is studying pulmonary function. Using a spirometer on herself as an example, she measures air volumes during seven inhalations and their corresponding exhalations (see Figure 1 below). She varies how much air she breathes in and out to examine different volumes and capacities that the lungs are capable of holding and moving.

Figure 1. Pulmonary volumes and capacities during several normal and forced inspirations and expirations. Created for Albert.io. Copyright 2017. All rights reserved.

Given the graph she generated during inhalations and exhalations, what does volume B represent?

A

Inspiratory capacity.

B

Total lung capacity.

C

Tidal volume.

D

Inspiratory reserve volume.

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