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Diaphragm and sternum returned to their normal thoracic volume due to
1) Relaxation of diaphragm and external intercostal muscles
2) Relaxation of diaphragm and internal intercostal muscles
3) Contraction of diaphragm and external intercostal muscles
4) Contraction of diaphragm and internal intercostal muscles
1) Relaxation of diaphragm and external intercostal muscles