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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.
1 Movement of air into and out of the lungs is called pulmonary ventilation, or breathing (Figure 13.3). 2  When inspiratory muscles contract, intrapulmonary volume increases, its pressure decreases, and air rushes in (inspiration).3  When inspiratory muscles relax, the lungs recoil and air rushes out (expiration). Each plunges into the hilus of the lung on its side. 2  The lungs are paired organs flanking the mediastinum in the thoracic cavity. 3  The lungs are covered with visceral pleura; the thorax wall is lined with parietal pleura. 4  Pleural secretions decrease friction during breathing.