The double-layered thin membranous sacs that cover the lungs are called _.
Correct answer: D. Pleura
- A. Alveoli
- B. Diaphragm
- C. Epithelial membrane
- D. Pleura
Explanation
D is correct becauseThe lungs are surrounded by a thin double-layered membrane known as the Pleural membrane. Pleural membranes play an important role in lubrication and reducing friction between body parts during respiration.
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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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