Choose the correct answer from the alternatives given.
Site of gaseous exchange in lungs is:

pulmonary chamber

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trachea

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bronchioles

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alveoli

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Solution

The correct option is D alveoli
Alveoli are tiny balloon shaped structures in the respiratory system. The alveoli are only one cell thick and are surrounded by blood capillaries. This allows the relatively easy passage of oxygen and carbon dioxide (CO2) between the alveoli and the blood. Alveoli are therefore the site of gaseous exchange in the respiratory system. So, the correct option is 'alveoli'.

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