Final answer:
Forced exhalation involves the contraction of the abdominal and internal intercostal muscles to generate pressure and expel air from the lungs.
Explanation:
During forced exhalation, the abdominal and internal intercostal muscles contract to generate pressure in the chest and abdomen, forcing air out of the lungs. The internal intercostal muscles assist in forced exhalation by drawing the ribs together to constrict the rib cage.
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