The air that remains in the lungs even after the most forceful expiration is the
Correct answer: C. residual volume
- A. tidal volume
- B. inspiratory reserve volume
- C. residual volume
- D. vital capacity
Explanation
About 1,200 cm3 cannot be expelled, and this residual volume keeps the alveoli partly inflated so they do not collapse and stick shut, and it also lets gas exchange continue between breaths. Because it can never be breathed out, it cannot be measured with a simple spirometer. Its presence is also why lungs float in water, a fact used in forensic medicine to show that a baby breathed after birth.
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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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