Assertion: diaphragm | /r/CapableOf | flatten rib
Facets:
Source sentences:
text: As we breathe in, the chest expands, the diaphragm flattens and the external intercostal muscles lift the ribs upwards and outwards to allow the lungs to fill with air.
text: As we breathe in, the chest expands, the diaphragm flattens and the external intercostal muscles lift the ribs upwards and outwards to allow the lungs to fill with air.