Answers

2015-06-09T20:10:12+08:00
When you inhale
* the diaphragm contracts.
* air is sucked into the lungs.

when you exhale
*ribcage drops
*the diaphragm relax.
*air is forced out.
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2015-06-09T22:32:31+08:00
Carbon dioxide and oxygen po!!!

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