Vital Capacity Components — FRCA Primary MCQ

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EasyPhysiology - RespiratoryVital Capacity ComponentsFRCA Primary

The vital capacity (VC) is the sum of:

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Correct answer: D — TV + IRV + ERV

VC = TV + IRV + ERV (the maximum volume that can be exhaled after a maximal inspiration). Normal VC in a 70 kg male is approximately 4.5 L. VC does NOT include RV (which cannot be exhaled). VC is reduced in: restrictive lung disease / neuromuscular weakness / obesity / pregnancy / and pain limiting deep breathing.

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist