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Nerve Impulses travel on phrenic nerves to muscle fibers in the diaphragm, contracting them.


As the dome-shaped diaphragm moves downward, the thoracic cavity expands.


At the same time, the external intercostal muscles may contract raising the ribs and expanding the thoracic cavity further


The intra-alveolar pressure decreases.


Atmospheric pressure, greater on the outside, forces air into the respiratory tract through the air passages.


The lungs fill with air.

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