When the diaphragm relaxes, air is exhaled by elastic recoil of the lung and the tissues lining the thoracic cavity in conjunction with the abdominal muscles, which act as an antagonist paired with the diaphragm's contraction.
Air is exhaled by elastic recoil of the lung lining the thoracic cavity in conjunction with the abdominal muscles. Air is exhaled by elastic recoil of the tissues lining the thoracic cavity in conjunction with the abdominal muscles. The diaphragm relaxes. The abdominal muscles act as an antagonist. This antagonist is paired with the diaphragm's contraction.