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The main muscles of inspiration are the diaphragm, external intercostal muscles, and parasternal intercartilaginous muscles. However, the diaphragm is probably the single most important muscle. The accessory muscles of inspiration are the sternocleidomastoid and scalenus. Unforced expiration is a passive process and requires relaxation of the above muscles. Forced expiration requires the internal intercostal muscles, rectus abdominis, external oblique, internal oblique and the transversus abdominis. Below is a web address that you can go to that has a good explination and animations of the process of breathing. http://www.ivimeds.org/intralibrary/open_virtual_file_path/i4088n13902t/RibMovements.swf drazx is the original author of this answer hey i am so conffused : so what do the rib muscles do during all of this you still havent answerd it ??? i really need halp plaease write back !!!! ASAP !!!

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