Which structure separates the thoracic and abdominopelvic cavities?

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Multiple Choice

Which structure separates the thoracic and abdominopelvic cavities?

Explanation:
The boundary between the thoracic and abdominopelvic cavities is formed by the respiratory diaphragm. This dome-shaped muscle acts as a physical partition between the chest and the abdomen, separating the thoracic cavity, which contains the heart and lungs, from the abdominal and pelvic viscera. The mediastinum is a region inside the thoracic cavity, not a boundary between cavities; the pleural cavities are also within the thoracic cavity around the lungs; and the parietal peritoneum lines the abdominopelvic cavity, not separating it from the thorax. The diaphragm thus serves as the dividing structure.

The boundary between the thoracic and abdominopelvic cavities is formed by the respiratory diaphragm. This dome-shaped muscle acts as a physical partition between the chest and the abdomen, separating the thoracic cavity, which contains the heart and lungs, from the abdominal and pelvic viscera. The mediastinum is a region inside the thoracic cavity, not a boundary between cavities; the pleural cavities are also within the thoracic cavity around the lungs; and the parietal peritoneum lines the abdominopelvic cavity, not separating it from the thorax. The diaphragm thus serves as the dividing structure.

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