Muscles on chest: The main muscles of respiration are the diaphragm and rib muscles. When the body senses the need to breathe deeper or harder, the muscles attached to the clavicles and shoulders are recruited. This usually only happens in cases of respiratory distress. Also, you could consider the nostril muscles as accessory muscles as they flare in similar circumstances, trying to get more air into the lungs.
Answered 12/9/2013
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