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What is the role of the diaphragm in my body?

When the diaphragm contracts, it flattens out, lowering the pressure in the lungs and allowing air in. When the diaphragm relaxes, it makes a dome shape, increasing the pressure in the lungs and pushing air out. (This answer provided for NATA by the University of Montana Athletic Training Education Program.)
Master Stephen Co
Alternative & Complementary Medicine

The diaphragm is a disk-shaped layer of muscle that bisects your chest cavity laterally. Attached to the bottom of the ribs and stretching backward and slightly downward to the lumbar vertebrae, it is quite flexible, but it is also one of the body’s toughest and strongest muscles. The diaphragm acts as a divider between your cardiopulmonary system and your digestive system: it’s the floor for your heart and lungs, and the roof for your stomach, intestines, spleen, liver, pancreas, and kidneys. There’s not a lot of room in your chest and abdomen; your organs are packed tightly. Thus when your diaphragm moves, it also moves your internal organs, giving them an internal massage. This is a good thing! Diaphragmatic movement stimulates the flow of blood and lymph into, through, and out of these organs in the chest and abdominal cavities.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.