Q:

Which statement may be used to defi ne a bronchiole?

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Which statement may be used to defi ne a bronchiole?


  1. They are the airways that branch from the left and right primary bronchi.
  2. They are kept open by “C” shaped rings of cartilage.
  3. Their walls have supporting cartilage between smooth muscle.
  4. Their walls contain smooth muscle but no cartilage.

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D: Bronchioles differ from all the larger airways in having no supporting cartilage. They do have smooth muscle. 

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