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Steps in the Process of Respiration

The site of e...

Question

The site of external respiration in lungs is

A

Trachea

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B

Bronchus

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C

Alveoli

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D

All of the above

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Solution

The correct option is D Alveoli
Alveoli are the functional units of the lungs that permit gas exchange between the air in the lungs and the blood in the capillaries of the lungs. Alveoli are found in small clusters called alveolar sacs at the end of the terminal bronchiole. External respiration is basically the transfer of gas between lungs and the outer environment. It takes place prior to internal respiration.
Thus, the correct answer is option C.

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