A) Inspiratory reserve volume plus tidal volume
B) Total lung capacity minus expiratory reserve volume
C) Inspiratory reserve volume plus expiratory reserve volume
D) Total lung capacity minus residual volume
Correct Answer: D
Solution :[d] Vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It is equal to the sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume. A person's vital capacity can be measured by a wet or regular spirometer. In combination with other physiological measurements, the vital capacity can help make a diagnosis of underlying lung disease. Furthermore, the vital capacity is used to determine the severity of respiratory muscle involvement in neuromuscular disease, and can guide treatment decisions in Guillain-Barre syndrome and my asthenic crisis. A normal adult has a vital capacity between 3 and 5 litres. A human's vital capacity depends on age, sex, height, mass, and ethnicity.
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