During inspiration, the decrease in intra-alveolar pressure compared to atmospheric pressure allows air to rush into the lungs.
The movement of air into the lungs is driven by a decrease in intra-alveolar pressure compared to atmospheric pressure, resulting from the expansion of the thoracic cavity during inspiration. The pressure gradient created allows air to rush into the lungs, facilitated by the contraction of the diaphragm and the expansion of the chest cavity.
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