Q:

A bronchiole differs from tertiary (and smaller) bronchi in that it:

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A bronchiole differs from tertiary (and smaller) bronchi in that it:


  1. has cartilage in its wall (& bronchi do not)
  2. does not have cartilage in its wall (& bronchi do)
  3. has smooth muscle in its wall (& bronchi do not)
  4. does not have smooth muscle in its wall (& bronchi do)

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B: While bronchi are held rigidly open by their cartilage, bronchioles do not have cartilage in their wall.

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