Vital capacity is defined as
Correct answer: D. the maximum volume of air that can be expelled after the deepest possible inspiration
- A. the air left in the lungs after the deepest possible expiration
- B. the volume of one quiet breath
- C. the volume of air in the dead space
- D. the maximum volume of air that can be expelled after the deepest possible inspiration
Explanation
Vital capacity is the sum of the tidal volume and the inspiratory and expiratory reserve volumes, so it measures the usable range of the lungs and falls in diseases such as emphysema and fibrosis. The air remaining after the fullest expiration is the residual volume, about 1,200 cm3, which cannot be expelled and keeps the alveoli from collapsing. Total lung capacity is vital capacity plus residual volume.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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