During inspiration , the intrapulmonary pressure is the atmospheric pressure. At this point the intrapulmonary pressure is greater that intrapleural pressure.
Air flows into the lungs largely due to difference in pressure , atmospheric pressure is greater than infra-alveolar pressure . It is changes during the different phases of breathing because the alveolar which connected to atmosphere via tubing of airways.Due to certain characteristics of the lungs the intrapleural pressure is always lower than or negative to the intra-alveolar pressure.
Intrapleural pressure air within the pleura cavity , Intra- alveolar pressure, between the visceral and parietal pleurae, , intrapleural pressure which is also changes during the different phases of breathing and due to certain characteristics of the lungs, the intra-alveolar pressure .
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