explain the process of breathing in and out . explain it's mechanism
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explain the process of breathing in and out . explain it's mechanism
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Answer:
the process of taking air into expelling it through the lungs is called breathing . the action of breathing in and out is due to changes of pressure within the throax ,in comparison with outside. when we inhale the intercostal muscles (between the ribs) and diaphragm contract to expand the chest cavity .
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