The direct power of pulmonary ventilation comes mainly from the pressure difference between the lung tissue, its own air pressure and the external atmospheric pressure. The pressure difference forms an active respiratory movement, mainly through the contraction and diastole of the respiratory muscles of the lung tissue itself. The pressure difference forms an active breathing movement, mainly through the contraction and diastole of the lung tissue itself. And when the respiratory muscles contract and then diastole, this process the pressure within the lungs will weaken and atmospheric pressure will press the air into the airway. This is repeated to form a respiratory movement that will cause normal ventilation of the lungs, which in clinical terms is known as the exchange of carbon dioxide and oxygen, forming a normal metabolism.