Which structure is the main site of gas exchange between inspired air and pulmonary capillary blood?
Correct answer: B. Alveolar sacs
- A. Terminal bronchioles
- B. Alveolar sacs
- C. Laryngeal cavity
- D. Main bronchi
Explanation
Alveolar sacs contain thin-walled alveoli surrounded by pulmonary capillaries, allowing rapid diffusion of gases. Bronchioles, bronchi and the larynx mainly conduct air and are not the principal exchange surfaces.
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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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