In the lungs, the air is separated from the venous blood through:
Correct answer: B. Squamous epithelium + endothelium of blood vessel
- A. Transitional epithelium + tunica externa of blood vessel
- B. Squamous epithelium + endothelium of blood vessel
- C. Squamous epithelium + tunica media of blood vessel
- D. None of the above
Explanation
In the lungs, the air in the alveoli is separated from the venous blood in capillaries by the thin squamous epithelium of the alveoli and the endothelial lining of the blood capillaries, which together form the respiratory membrane that allows efficient gas exchange.
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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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