Pulmonary ventilation occurs because of pressure differences between the lungs and the external environment.

Question

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Pulmonary ventilation occurs due to the pressure differences between the lungs and the external environment. During inhalation, the diaphragm and other muscles contract, causing an increase in the volume of the thoracic cavity and a decrease in pressure within the lungs. As a result, air flows into the lungs. During exhalation, the diaphragm and muscles relax, causing a decrease in the volume of the thoracic cavity and an increase in pressure within the lungs, leading to the expulsion of air from the lungs.

Pulmonary Ventilation Occurs Because of Pressure Differences Between the Lungs