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The Diaphragm.
When the diaphragm contracts, it increases the size of the thoracic cavity (chest), which lowers the air pressure, causing outside air to flow in.
The external intercoastals are also used in breathing. They are the muscles on your ribs, that pull on your rib cage and help to expand the chest cavity.

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15y ago
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14y ago

The diaphragm is the muscle that aids in breathing.

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7y ago

Most people would say "The lungs." The correct answer is the diaphragm. It allows your chest to expand and contract to make room for your lungs, which are organs.

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Q: Which is the major muscle for breathing?
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