Answers

2014-06-21T16:38:20+08:00
When you breathe in or inhale the diaphragm muscle contracts when you breathe out or exhale.
exhale the diaphragm muscles relaxes (yan po yung continuation)
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2014-06-21T16:39:34+08:00
Breathing,when you inhale air(oxygen) enter your system when you exhale carbon dioxide comes out of your system.grade 9 ka po? same question yan sa amin group act.eh. ;)
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