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GATE 2023 BM – Question 50

Mammalian Cell Biology, Human Anatomy and Physiology · Respiratory System · 2 marks · Multiple select

Which relations between lung-volume measurements are correct?

  1. Vital capacity minus expiratory reserve volume equals inspiratory capacity
  2. Vital capacity plus expiratory reserve volume equals inspiratory capacity
  3. Total lung capacity equals inspiratory capacity plus functional residual capacity
  4. Functional residual capacity is expiratory reserve volume minus residual volume

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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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