ACTIVITY 1:BREATHE IN AND BREATHE OUT,WHAT HAPPEN TO THE SMALLER BALLONS AS YOU PULL AND PUSH THE BALLON AT THE BOTTOM?
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As the ballon at the bottom of the model was pulled down or when we breathe in, diaphragm muscles contract and move down and the chest cavity expands . ... As the ballon was pushed up or when we breathe out, the diaphragm and the chest cavity relax and return to its original size and place.
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