Question at position 7 The membranes that surround the lungs consists of two layers, the __________ and __________.visceral and mediastinum pleuraevisceral and parietal pericardiumvisceral and parietal pleuraemediastinum and parietal pleurae

Question

Question at position 7 The membranes that surround the lungs consists of two layers, the __________ and __________.visceral and mediastinum pleuraevisceral and parietal pericardiumvisceral and parietal pleuraemediastinum and parietal pleurae

BlackTom AI · Accepted Answer

The lungs are enveloped by two layers of pleura: the visceral pleura and the parietal pleura.

1) Relevant knowledge points and concepts
- Pleura: a serous membrane in the thoracic cavity with two layers. 
- Visceral pleura: the inner layer adherent directly to the lung surface, including into fissures. 
- Parietal pleura: the outer layer that lines the inner surface of the thoracic wall, diaphragm, and mediastinum. 
- Pleural cavity: the potential space between these two layers containing a small amount of lubricating fluid to reduce friction during breathing. 
- Pericardium: a distinct serous membrane surrounding the heart, not the lungs. The mediastinum is an anatomical space, not a pleural layer.

2) Step-by-step reasoning
- Identify which membranous layers are associated specifically with the lungs: the terms “visceral pleura” and “parietal pleura” are the established pair for lung coverings.
- Compare each answer option to this anatomical fact:
  a) “visceral and mediastinum pleurae” — incorrect because the mediastinum is a compartment, not a pleural layer.
  b) “visceral and parietal pericardium” — incorrect because the pericardium surrounds the heart (pericardial sac), not the lungs.
  c) “visceral and parietal pleurae” — matches the two pleural layers that surround the lungs.
  d) “mediastinum and parietal pleurae” — incorrect because the mediastinum is not a pleural layer; it is a thoracic region between the pleural sacs.

3) Calculations / intermediate steps
- No numeric calculations are required; the logic is anatomical classification: pair visceral with parietal as the two pleural layers.

4) Why the correct answer is correct
- Anatomical nomenclature and function define the lung coverings as visceral pleura (adherent to lung) and parietal pleura (lining the thoracic cavity). These two together form the pleural sac around each lung.

5) Why other options are incorrect (brief)
- Options mentioning the pericardium refer to the heart’s covering, not the lungs. Options invoking the mediastinum misuse a region name as if it were a membrane.

6) Conclusion
- Therefore, the correct answer is “visceral and parietal pleurae,” which matches the provided answer.

Question at position 7 The membranes that surround the lungs consists of two layers, the and .visceral and mediastinum pleuraevisceral and parietal pericardiumvisceral and parietal pleuraemediastinum and parietal pleurae单项选择题

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Question at position 7 The membranes that surround the lungs consists of two layers, the __________ and __________.visceral and mediastinum pleuraevisceral and parietal pericardiumvisceral and parietal pleuraemediastinum and parietal pleurae单项选择题