The total inside capacity of lungs of adult human beings when fully inflated is:
Correct answer: D. 5000 ml
- A. 5 ml
- B. 50 ml
- C. 500 ml
- D. 5000 ml
Explanation
The total lung capacity is approximately 5 L. Of this, 1.5 L, the residual volume, remains at the end of forced expiration. The volume of gas, 3.5 L, that can be inhaled from forced expiration to forced inspiration is the vital capacity. The normal tidal volume (500 mL) is a small proportion of the maximum 3.5 L that is possible. The tidal volume is situated in the middle of the vital capacity, so that the inspiratory reserve volume is approximately 1.5 L, as is the expiratory reserve volume.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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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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