What happens to the muscles of diaphragm the ecternal intercostals?
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The muscles required for ventilation include the diaphragm, the external and internal intercostal muscles, and the abdominalmuscles. ... Contraction of the diaphragmforces the abdominal contents back, increasing the length of the thoracic cavity, and pulls the ribs abaxially, increasing the width of the abdominal cavity.
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