Which statement is correct?
1 )
Alveoli have goblet cells to produce mucus to trap pathogens from the air.
Cartilage in the bronchi keeps the bronchi open and allows air to flow through freely.
3 )
Complete rings of cartilage in the bronchioles make sure that air can reach the alveoli.
4 )
During exercise, muscles in the bronchioles and alveoli relax to allow a greater flow of air.
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