why does gas exchange only happens in the alveoli, and not along the length of the bronchi and bronchioles
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Exchange of gas is possible in alveoli due to :-
1. They have a very thin wall which is only one molecule thick which allows the gases to diffuse easily.
2. They provide a large surface area for gaseous exchange.
3. Due to presence of a dense capillary network the transportation and pick up of oxygen becomes convenient.
Due to these features of alveoli, gaseous exchange becomes possible in it and not in bronchi or bronchioles.
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