. The structural and functional unit of lung is
A: Alveoli
B: Trachea
C: Bronchiole
D: Bronchus
Best Answer
Explanation : The alveoli is the site of exchange of the carbon dioxide and oxygen during the breathing process.
Alveoli are thin, irregular shaped vascularised bag like structures. It is the respiratory part of the lungs.
Whereas, Trachea, Bronchiole and Bronchus are the conducting part.
Therefore, Alveoli is the structural and functional unit of lungs.
Final Answer : Option A is correct.
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