What is the approximate normal tidal volume of an adult at rest?
Correct answer: A. 500 mL per breath
- A. 500 mL per breath
- B. 1,000 mL per breath
- C. 1,500 mL per breath
- D. 2,000 mL per breath
Explanation
Tidal volume is the amount of air moved in or out during one quiet breath, and it is about 500 mL in a healthy adult. The larger values describe volumes that require deeper breathing rather than normal resting ventilation.
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About Respiratory System
The respiratory system includes the air passages, lungs, pleura, alveoli and the mechanics of breathing. It explains pulmonary ventilation, gas exchange, oxygen and carbon dioxide transport, regulation of breathing, and the difference between external respiration in the lungs and internal respiration in body tissues.
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