Your patient has multiple sclerosis. Neuromuscular disorders such as multiple sclerosis may lead to a decreased vital capacity. What does vital capacity measure?
A) The volume of air inhaled and exhaled with each breath
B) The volume of air in the lungs after a maximum inspiration
C) The maximum volume of air inhaled after normal expiration
D) The maximum volume of air exhaled from the point of maximum inspiration
Ans: D
Feedback: Vital capacity is measured by having the patient take in a maximal breath and exhale fully through a spirometer. Vital lung capacity is the maximum volume of air exhaled from the point of maximum inspiration, and neuromuscular disorders such as multiple sclerosis may lead to a decreased vital capacity. Tidal volume is defined as the volume of air inhaled and exhaled with each breath. The volume of air in the lungs after a maximum inspiration is the total lung capacity. Inspiratory capacity is the maximum volume of air inhaled after normal expiration.
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