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from | Encarta |  |
Diaphragm and Respiration |
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| As the diaphragm contracts and moves downward, the pectoralis minor and intercostal muscles pull the rib cage outward. The chest cavity expands, and air rushes into the lungs through the trachea to fill the resulting vacuum. When the diaphragm relaxes to its normal, upwardly curving position, the lungs contract, and air is forced out. | ||||||
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| Appears in these articles: | ||||||
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| Lung; Diaphragm (anatomy); Respiratory System | ||||||
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