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The diaphragm muscle separates the thoracic cavity from the abdominal cavity.
The muscle that divides the thoracic cavity from the abdominal cavity is the diaphragm. The diaphragm is a dome-shaped sheet of muscle and tendon located beneath the lungs and heart. It separates the thoracic cavity, which contains the heart and lungs, from the abdominal cavity, which houses the digestive organs such as the stomach, liver, and intestines.
During inhalation, the diaphragm contracts and moves downward, increasing the volume of the thoracic cavity and allowing the lungs to expand with air. During exhalation, the diaphragm relaxes and moves upward, decreasing the volume of the thoracic cavity and aiding in the expulsion of air from the lungs.