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9.1 Gas exchange
9.2 Lungs
9.3 Trachea, bronchi and bronchioles
9.4…
9.1 Gas exchange
9.2 Lungs
9.3 Trachea, bronchi and bronchioles
9.4 Warming and cleaning the air
9.5 Alveoli
Lungs
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Bronchioles are surrounded by smooth muscle which can relax during exercise to increase diameter and therefore air flow
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