In 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 lungs, the air is separated from the venous blood through squamous epithelium and endothelium of blood vessel. As a result, the barriers between the air in an alveolus and the blood in its capillaries is only about 0.5 mm.
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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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