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The diaphragm separates the thoracic cavity containing the heart and lungs, from the abdominal cavity and performs an important function in respiration: as the diaphragm contracts, the volume of the thoracic cavity increases and air is drawn into the lungs.
The lungs are enclosed in the thoracic cavity by the rib cage on the front, back, and sides with the diaphragm forming the floor of the cavity. When we inhale, the diaphragm contracts and is drawn inferiorly into the abdominal cavity until it is flat.