that is, the respiratory system, the diaphragm and the other respiratory muscles start to exchange air through the airway and lungs.
(the respiratory system, the diaphragm and the other respiratory muscles; start; ) (the respiratory system, the diaphragm and the other respiratory muscles; to exchange; air)
the respiratory system, the diaphragm and the other respiratory muscles the respiratory system, the diaphragm and the other respiratory muscles
start to exchange
air