why do lungs have small external opening when large ones would let more air in?
回答 (1)
2010-05-17 10:25 pm
✔ 最佳答案
The small holes are to give them a larger surface area, to let in oxygen, not for the oxygen to go through the holes themselves. Large holes would actually have a smaller surface area than small holes.
參考: At least that's what i always thought....
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https://hk.answers.yahoo.com/question/index?qid=20100517142059AAaj4fQ