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What is the primary function(s) of the alveoli?

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What is the primary function(s) of the alveoli?

(a) Transfer of oxygen to the blood

(b) Removal of carbon dioxide from the blood

(c) Transfer of toxic substances to the blood

(d) All of the mentioned

This question was posed to me in a national level competition.

This key question is from Air Pollution in chapter Air Pollution of Environmental Engineering

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The correct option is (d) All of the mentioned

Explanation: The thin walls of the alveoli contain capillaries which aid in transfer of oxygen and toxic substances into the blood and removal of carbon dioxide.

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