Which statement about carbon dioxide transport is correct?
Correct answer: A. Most carbon dioxide travels as bicarbonate ions
- A. Most carbon dioxide travels as bicarbonate ions
- B. Most carbon dioxide remains trapped in the alveoli
- C. Carbon dioxide binds only to white blood cells
- D. Carbon dioxide is transported mainly as free gas bubbles
Explanation
Most carbon dioxide is converted to bicarbonate ions and carried in plasma. Smaller amounts bind to haemoglobin or remain dissolved, so it is not normally carried as gas bubbles.
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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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