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Intrapulmonary pressure is always greater than intrapleural pressure. Inspiration decreases intra-pulmonary pressure, allowing air to enter the lungs, while expiration increases this pressure, causing air to leave the lungs.
Intrapulmonary pressure is always greater than intrapleural pressure. During inspiration, the diaphragm contracts, increasing thoracic volume and decreasing intra-pulmonary pressure, allowing air to enter the lungs. Expiration is a passive process where the diaphragm and intercostal muscles relax, leading to a decrease in thoracic volume and an increase in intra-pulmonary pressure, causing air to leave the lungs.
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