Dead space in the lungs symptoms8/26/2023 However, the ability to breathe-to have air enter the lungs during inspiration and air leave the lungs during expiration-is dependent on the air pressure of the atmosphere and the air pressure within the lungs. The intra-alveolar and intrapleural pressures are dependent on certain physical features of the lung. The major mechanisms that drive pulmonary ventilation are atmospheric pressure ( P atm) the air pressure within the alveoli, called intra-alveolar pressure ( P alv) and the pressure within the pleural cavity, called intrapleural pressure ( P ip). Pulmonary ventilation is the act of breathing, which can be described as the movement of air into and out of the lungs.
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