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how does the movement of the diaphragm cause air to go in and out of the lungs



Sagot :

the lungs movement will deplete & expand . when you inhale it will deplete, and when yo exhale it will expand . 
When the diaphragm contracts we breathe in O² (inhalation process takes place).
When the diaphragm relaxes we take out CO² (exhalation process takes place).