In humans the alveoli are the functioning units of external respiration.

True

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False

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Solution

The correct option is A True
Alveoli are an important part of the respiratory system whose function is to exchange oxygen and carbon dioxide molecules to and from the bloodstream.
Alveoli are tiny, balloon-shaped air sacs present at the very end of the respiratory tree and are arranged in clusters throughout the lungs.
A typical pair of human lungs contain about 480 million alveoli. Hence, In humans, the alveoli are the functioning units of external respiration.
So, the correct answer is 'True'.

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