Does Intrapulmonary Pressure Increase During Inspiration?

During inspiration, the diaphragm and the inspiratory intercostal muscles actively contract, leading to the expansion of the thorax. The intrapleural pressure (which is usually -4 mmHg at rest) becomes more subatmospheric or more negative.

What happens to intrapulmonary pressure during inspiration?

During inspiration, the diaphragm contracts and the thoracic cavity increases in volume. This decreases the intraalveolar pressure so that air flows into the lungs. Inspiration draws air into the lungs.

Does inspiration decrease Intrapulmonary pressure?

During inspiration, intrapleural pressure drops, leading to a decrease in intrathoracic airway pressure and airflow from the glottis into the region of gas exchange in the lung. The cervical trachea is exposed to atmospheric pressure, and a pressure drop also occurs from the glottis down the airway.