Across the respiratory membrane, oxygen and carbon dioxide move mainly by which process?
Correct answer: A. Simple diffusion
- A. Simple diffusion
- B. Active transport
- C. Facilitated diffusion
- D. Osmosis
Explanation
Respiratory gases cross the thin alveolar-capillary membrane by simple diffusion down their partial-pressure gradients. Active transport requires cellular energy, while osmosis applies specifically to water movement.
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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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