Sagot :
when you inhale
* the diaphragm contracts.
* air is sucked into the lungs.
when you exhale
*ribcage drops
*the diaphragm relax.
*air is forced out.
* the diaphragm contracts.
* air is sucked into the lungs.
when you exhale
*ribcage drops
*the diaphragm relax.
*air is forced out.