A healthy adult has a respiratory rate of 12 breaths per minute and a tidal volume of 500 mL. What is the approximate minute ventilation?
Correct answer: C. 6 litres per minute
- A. 2 litres per minute
- B. 4 litres per minute
- C. 6 litres per minute
- D. 12 litres per minute
Explanation
Minute ventilation equals respiratory rate multiplied by tidal volume: 12 × 500 mL = 6000 mL, or 6 litres per minute. This is total air moved, not the amount reaching alveoli for gas exchange.
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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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