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diaphragm
Normal relaxed breathing is referred to as tidal volume. This is produced by the action of the diaphragm muscle only. It is also referred to as diaphragmatic breathing and is associated with a relaxed state.
These are diaphragm and externa intercostal muscles in quiet breathing and sternocliedomastoid ,sclene muscles,anterior serrati in heavy breathing
The deep thorax muscles are the deep muscles of the thorax that promotes the inspiratory phase of breathing. When breathing the diaphragm contracts, producing a negative pressure, which forces are into the lungs.
There are several muscles that are responsible for breathing. They are the Diaphragm, the external intercostal muscle, and the internal intercostal muscle.
external/ internal intercostals
Ribs are for protection i think and diaphragm is the muscle controlling inhaling and exhaling. Also: the rib muscles can help the breathing process, which is useful when the diaphragm is weak, constricted, or to get an extra-big breath. Breathing from the diaphragm makes the belly move in and out as the lungs extend downwards. Breathing from the rib muscles makes the chest expand and rise.
For relaxed breathing, called tidal breathing, all you need is the diaphragm muscle.
Diaphragm
external intercostals and the diaphragm
diaphragm....
And the *diaphragm*