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6 terms

Steps of Inspiration

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1
Nerve Impulses travel on phrenic nerves to muscle fibers in the diaphragm, contracting them.
2
As the dome-shaped diaphragm moves downward, the thoracic cavity expands.
3.
At the same time, the external intercostal muscles may contract raising the ribs and expanding the thoracic cavity further
4
The intra-alveolar pressure decreases.
5
Atmospheric pressure, greater on the outside, forces air into the respiratory tract through the air passages.
6
The lungs fill with air.