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Common procedures used to evaluate the respiratory muscles are maximum inspiratory pressure and maximum expiratory pressure. However, there is little consensus concerning these methods.ommon procedures used to evaluate the respiratory muscles are maximum inspiratory pressure and maximum expiratory pressure. However, there is little consensus concerning these methods.
The lungs are surrounded by the pleural cavity, a lining of two lubricated layers that allows the negative pressure of breathing to be maintained without friction. The negative inspiratory force in the chest is due to the action of the diaphragm, a muscle below the lungs which separates the chest from the abdomen.