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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.
Parts of the respiratory system. As we breathe, oxygen enters the nose or mouth and passes the sinuses, which are hollow spaces in the skull. Sinuses help regulate the temperature and humidity of the air we breathe.