The most important muscles involved in eupnea are the diaphragm and the external intercostal muscles.

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The diaphragm and the external intercostal muscles are the primary muscles involved in the process of eupnea, which is the normal, unlabored breathing that occurs at rest. The diaphragm is a dome-shaped muscle located at the base of the lungs, while the external intercostal muscles are located between the ribs and help to lift the ribcage and increase the volume of the chest cavity during inhalation. Together, these muscles work to create the negative pressure that allows air to flow into the lungs, and then relax to allow for exhalation.

The Most Important Muscles Involved in Eupnea Are the Diaphragm