Inspiratory Capacity TV + IRV — FRCA Primary MCQ

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EasyPhysiology - RespiratoryInspiratory Capacity TV + IRVFRCA Primary

The inspiratory capacity (IC) is the sum of:

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Correct answer: C — TV + IRV

IC = TV + IRV (the maximum volume that can be inspired from FRC). Normal IC is approximately 3.5 L. IC = TLC - FRC. During exercise IC increases as FRC decreases (due to increased expiratory muscle activity). IC is reduced in hyperinflation (COPD / asthma) where FRC is increased.

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist