The gas-exchange portion of the human respiratory system is the:
Correct answer: D. Alveoli
- A. Larynx
- B. Trachea
- C. Bronchi
- D. Alveoli
Explanation
The gaseous exchange in the human respiratory system takes place between the alveoli and capillaries of the lungs. Both the alveoli and capillaries are single made of a single layer of cells, the endothelium or the squamous epithelium that permits the exchange or diffusion of gases, that is oxygen (alveoli) and carbon dioxide (capillaries). So, the correct answer is 'Alveoli'.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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