Answers

2016-06-23T14:39:01+08:00
When we inhale or exhale an exchange of essential gases takes place within our lungs,as we inhale we take in oxygen for our body to utilize and then the used up air will return back to the lungs where it will be expelled as carbon dioxide.
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2016-06-23T21:10:57+08:00
When you say "take place"is the exchange of the gases that occurs mainly alveoli that process commonly called respiration.
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