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Breathe out:

When the intercoastal muscle relaxs,the rib cages moves downwards and inwards,the diaphragm will moves up.The volumn of chest decreases and gas pressure increases.The air then breathe out.

Breathe in:

When the intercoastle muscle contracts,the rib cages move upward and outward,and the diaphragm moves down.the volumn of chest then increases and gas pressure decreases.Air then enter the lungs.

the actions of intercostle muscle,diaphragm and ribs bring about breathing

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15y ago

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