What occurs at a lung volume equivalent to the functional residual capacity (FRC) ?
I.The forces of the chest wall and lungs are in balance.
II.Chest wall expansion is offset by lung contraction.
III.Opposing chest wall-lung forces generate negative P_pl.

Question

Quizplus · Accepted Answer

At the functional residual capacity (FRC), the outward force of the chest wall is balanced by the inward recoil of the lungs, meaning both I and II are correct. Additionally, this balance of forces results in a negative intrapleural pressure, which is what III describes.

What Occurs at a Lung Volume Equivalent to the Functional