alleryStart learning →Functional residual capacity is the sum of which two volumes?
ATidal volume and residual volume
BExpiratory reserve and residual volume
CInspiratory reserve and tidal volume
DInspiratory reserve and residual volume
Answer & Solution
Correct answer: B. Expiratory reserve and residual volume
1. Functional residual capacity is the air remaining in the lung after a normal tidal expiration.
2. That remaining air is what could still be forced out plus what can never be forced out.
3. So FRC = ERV + RV, which makes the second option correct.
4. Inspiratory reserve volume lies above the resting level and so cannot form part of what remains after a tidal expiration.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.3 The Process of Breathing_
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