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The large dome-shaped muscle (not an organ) that separates the thoracic (chest) cavity from the abdominal cavity and aids in breathing is the diaphragm. Actually fibromuscular, the diaphragm is the main muscle that we use to inflate our lungs. It forms a partition between the two cavities, and creates a 'seal'. It allows the lungs to expand so we can take in and expel air. It is part of both the muscular and respiratory systems.

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8y ago
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8y ago

The diaphragm.

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12y ago

diaphragm

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13y ago

diaphragm

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7y ago

Diaphragm

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Q: What is the large domed shaped muscle that separates the lungs from the abdomen?
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