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  3. Unit 7. animal structure and
  4. The respiratory system
  5. Systems of gas exchange

39.1 Systems of gas exchange  (Page 6/25)

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6 / 25  Air is warmed and humidified in the nasal passages. This helps to ________.
A  ward off infection
B  decrease sensitivity during breathing
C  prevent damage to the lungs
D  all of the above
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Practice MCQ 3 FlashCards 2 Key Terms 16

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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