The pleura is a thin membranous sac that covers the lungs with:
Correct answer: C. Double-layer
- A. Single-layer
- B. Triple-layer
- C. Double-layer
- D. Pair of double layers
Explanation
The pleura consists of two layers: the visceral pleura, which is the inner layer that directly covers the lung surface, and the parietal pleura, which is the outer layer that lines the inner surface of the chest cavity. Together, the visceral and parietal layers form a pair of double layers that enclose the lungs.
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About Digestion
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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