The movement of air out of the lungs during forceful expiration is a result of Air is forced out of the lungs due to the active contraction of the abdominal and external intercostal muscles. O Air moves out of the lungs due to the passive relaxing of the diaphragm and intercostal muscles. Air is forced out of the lungs due to the active contraction of the abdominal and internal intercostal muscles. O Air moves out of the lungs due to the passive elastic recoil of the chest wall and lungs.

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