Breathing In The ____ intercostal ____ contract. This moves the ribs ____ and outwards. The ____ contracts. This flattens the diaphragm. Both of these movements increase the volume of the ____ which ____ the pressure inside the thorax. Air is pushed into the lungs by the ____ pressure outside the body. Breathing Out The external intercostal muscles ____, this moves the ribs ____ and inwards. The diaphragm relaxes and this ____ up into the thorax. The volume in the thorax ____. This increases the ____ inside the thorax and air is ____ out of the lungs.

Breathing

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