The most important muscle(s)of forced expiration is (are)the

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The most important muscles of forced expiration are the internal intercostals and the abdominal muscles. The internal intercostals help to lower the rib cage, which decreases the volume of the thoracic cavity, while the abdominal muscles increase intra-abdominal pressure, pushing up on the diaphragm, further decreasing the volume of the thoracic cavity, thus aiding in forced expiration.

The Most Important Muscle(s)of Forced Expiration Is (Are)the