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During inspiration:The external intercostal and diaphragm muscles .........1.......... . This causes the rib cage to move .........2....... and .........3......... and the diaphragm to .........4.........., increasing the volume of the thoracic cavity. As this increases, the lung pressure ........5...... to below atmospheric pressure so air flows from an area of .....6..... concentration to ....7.....
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