Question

what is functional residual capacity?
amount of air that remains in the lungs after a normal exhale
the amount of air that remains in the lungs after a forceful exhale
the amount of air that is inhaled and exhaled during a single breath
the amount of air that can be forcefully exhaled after a normal exhale
the amount of air that is inhaled during a normal breath

Explanation:

Functional residual capacity (FRC) is defined as the amount of air that remains in the lungs after a normal exhalation. It is the sum of the expiratory reserve volume (ERV) and the residual volume (RV). FRC is important as it prevents the alveoli from collapsing and maintains gas exchange during the resting phase between breaths.

• The amount of air that remains in the lungs after a forceful exhalation is the residual volume (RV).
• The amount of air that is inhaled and exhaled during a single breath is the tidal volume (TV).
• The amount of air that can be forcefully exhaled after a normal exhalation is the expiratory reserve volume (ERV).
• The amount of air that is inhaled during a normal breath is also related to tidal volume (as tidal volume is the volume of air inhaled or exhaled during normal breathing).

Answer:

Amount of air that remains in the lungs after a normal exhale