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Source(s): myself.... The only organ that helps you breath is your lungs. There are two muscle groups that help breath, the diaphragm and the intercostal muscles (the muscles between the ribs). The diaphragm will move up and down causing air to be inhaled or exhaled. When you breathe in you are increasing the pressure in your lungs, the muscles help with this.
1 Bronchi: The bronchi branch from the trachea into each lung and create the network of intricate passages that supply the lungs with air.  Diaphragm: The diaphragm is the main respiratory muscle that contracts and relaxes to allow air into the lungs.