Cilia in the trachea

  1. sweep mucus up to the throat
  2. make mucus
  3. exchange gases
  4. produce antibodies
Answer

A) sweep mucus up to the throat

Beating cilia move mucus away from the lungs. O Level Biology · Topic 9 Human Gas Exchange · 9.1 Human gas exchange

Biology MCQ · More O Level Biology: Human Gas Exchange MCQs · Practise