Which statement correctly describes external respiration?
Correct answer: B. Exchange of gases between alveoli and pulmonary blood
- A. Exchange of gases between blood and body tissues
- B. Exchange of gases between alveoli and pulmonary blood
- C. Use of oxygen by cells to produce cellular energy
- D. Movement of air between the atmosphere and alveoli
Explanation
External respiration is the exchange of oxygen and carbon dioxide between alveolar air and pulmonary capillary blood. Gas exchange between systemic blood and body cells is called internal respiration.
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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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