Correct answer: (A) Vital capacity minus expiratory reserve volume equals inspiratory capacity; (C) Total lung capacity equals inspiratory capacity plus functional residual capacity
Explanation
Write VC=IRV+TV+ERV, IC=IRV+TV and FRC=ERV+RV. Subtracting ERV from VC gives IC, A. Adding IC and FRC gives IRV+TV+ERV+RV=TLC, C. B adds rather than removes ERV, and D should contain a sum, not a difference. Thus A and C.
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