The lungs are elastic in themselves, they are attached to the ribcage by the pleura where you’ll find a vacuum and a liquid protecting that fine mechanism. Any muscle attached to the ribcage can influence it's movements.
The basic mechanism of breathing involves a change in the size of the thoracic cavity.
During inspiration there is a increase in the volume of the thoracic cavity, the diaphragm descends and the rib cage opens. It leads to a decrease in the intra- thoracic pressure causing the air to be drawn into the lungs.
During expiration there is a decrease in volume of thoracic cavity, an elastic recoil of lungs and the diaphragm goes up. It leads to increase intra- thoracic pressure causing the air to be pushed out of the lungs.
The basic requirements of the respiratory system in order to keep working is simply having clear passages ways and let the moving parts move.
Of course if we have extra muscle tension in any part of the body, that extra tension will definitely affect our natural breath rhythm.
I find the Alexander Technique a wonderful tool to restore natural breath.
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