The volume of air moved in or out of the lungs during one normal quiet breath is called the
Correct answer: B. tidal volume
- A. vital capacity
- B. tidal volume
- C. residual volume
- D. total lung capacity
Explanation
The tidal volume of an adult at rest is about 500 cm3, of which roughly 150 cm3 stays in the airways as dead space and never reaches the alveoli. Vital capacity is the much larger volume, around 4,500 cm3, that can be moved between the deepest possible inspiration and the fullest expiration. The two are commonly confused because both are measured on the same spirometer trace.
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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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