The figure below illustrates the inhalation step of gas exchange in humans.
![The figure below illustrates the inhalation step of gas exchange in humans. In this figure, the diaphragm and the muscles of the rib cage are ____________________ [relaxed or contracted].](https://d2lvgg3v3hfg70.cloudfront.net/TB1040/11ea435e_2a89_ebbb_a5da_a38b776fc912_TB1040_00.jpg)
In this figure, the diaphragm and the muscles of the rib cage are ____________________ [relaxed or contracted].
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