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Question

In lungs, gaseous exchange takes place in

A
bronchioles
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B
alveoli
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C
epiglottis
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D
trachea
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Solution

The correct option is B alveoli
Trachea divides into bronchi and bronchi divide into bronchioles. Bronchioles branch further inside the lungs and end in very thin-walled sac like structures called air sacs or alveoli.
Alveoli are the structural and functional units of lungs as these are the actual sites of gaseous exchange.

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