Bronchioles differ from bronchi because bronchioles have

  1. squamous epithelium only
  2. C-shaped cartilage
  3. no smooth muscle
  4. no cartilage
Answer

D) no cartilage

Bronchioles lack cartilage. AS & A Level Biology · Topic 9 Gas Exchange · 9.1 The gas exchange system

Biology MCQ · More A Level Biology: Gas exchange MCQs · Practise