The Lungs

The Lungs

1. When you breathe in your lungs expand because ;

   • Your diaphragm contracts and moves down so that the new oxygen can fill the lungs
   • Your intercostal muscles (the muscles between your ribs )are contracting to lift your ribs up and outwards

2. When the muscles in your thorax relax this means you are brething out

   • Breathing in increases the size of your thorax

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