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Category - Sciences

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Where within the respiratory system does the exchange of gases (otherwise known as diffusion) occur?

Larynx
Bronchioles
Alveoli
Alveolar sacs

Explanation

Answer - D - The actual exchange of gases within the respiratory system occurs in the alveolar sacs. These are the smallest structure within the lungs and it is here that the exchange of oxygen and carbon dioxide occurs, passing these gases into or out of the bloodstream.

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