The diaphragm muscle is primarily responsible for powering breathing and aiding in projection. It is a large, dome-shaped muscle located at the base of the lungs and separates the chest cavity from the abdominal cavity. When the diaphragm contracts, it moves downward, creating more space in the chest cavity and allowing the lungs to expand and fill with air. This is essential for inhalation. When the diaphragm relaxes, it moves back up, pushing air out of the lungs, which is important for exhalation. Additionally, the diaphragm plays a crucial role in providing support and control for projecting the voice during speaking or singing.
