Which of the following is the respiratory surface in human beings?
Correct answer: B. Alveoli
- A. Lungs
- B. Alveoli
- C. Windpipe
- D. Alveolar duct
Explanation
The respiratory surface is the actual surface where the exchange of gases actually takes place. In humans, the respiratory surface is the alveoli. Hence, option B is the correct option.
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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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