Answers

2015-07-01T12:09:23+08:00
When you inhale- the intercostal muscles contract, expanding the rib cage the diaphgram contracts, pulling downwards to increase volume of the chest.
When you exhale- the intercostal muscles relax, rib cage drops inwards and downwards
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2015-07-01T15:42:06+08:00
Life cycle between plants and human being. When we inhale, we receive oxygen from plants, and when we exhale, we produce carbon dioxide that plants needed.
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